A PhD literature review is a critical synthesis of published research that argues why your study is needed, proving you command the field — not a summary.
A PhD literature review is a critical synthesis of published research that argues why your study is needed, proving you command the field — not a summary. For Vietnamese postgraduates trained in a more descriptive academic tradition, this shift from "reporting what others said" to "arguing where the field falls short" is the single hardest adjustment, and the one examiners watch most closely.
The good news: the literature review is a learnable structure, not a talent. Once you see the moves a strong review makes, you can reproduce them chapter after chapter. This guide answers the seven questions Vietnamese PhD candidates ask MAAS mentors most often when they sit down to write the review chapter.
Author: MAAS Editorial Team · Reviewed by a Senior Research Methods mentor (PhD, Education & Social Sciences)
Last updated: 2026-06-01
Category: thesis-dissertation
What is a PhD literature review, and what is it not?
Direct answer: A PhD literature review is a structured argument that maps, evaluates and synthesises existing scholarship to locate the gap your research will fill. It is not an annotated bibliography, a chronological list of studies, or a series of summaries strung together. Every paragraph should advance a claim about the state of knowledge, not just report what one author did.
Evidence: The University of Edinburgh's Institute for Academic Development defines the review's purpose as "to demonstrate a comprehensive grasp of the field and to justify the contribution of your own work" — justification, not description. Cooper's (1988) widely cited taxonomy similarly distinguishes reviews that integrate and critique literature from those that merely enumerate it; doctoral examiners expect the former.
Example: A MAAS PhD candidate in 2024 at a UK Russell Group university opened her first draft with twelve paragraphs each beginning "Nguyen (2019) found…", "Tran (2020) found…". Her supervisor flagged it as "a reading log, not a review." Reframing each cluster around a theme ("Three competing explanations for X exist in the literature, but none accounts for Y") turned the same sources into an argument and the chapter was approved on the next pass.
How long should a PhD literature review be?
Direct answer: Most PhD literature review chapters run 8,000–15,000 words, or roughly 20–30% of the thesis, though there is no universal rule and your supervisor and discipline set the real target. Quality of synthesis matters far more than raw length — a tight 9,000-word review that argues clearly beats a 16,000-word chapter that summarises.
Evidence: Surveys of UK doctoral theses by the discipline guidance at the University of Leeds and Vitae's Researcher Development materials place review chapters most commonly in the 8,000–12,000 word band for social sciences and humanities, with STEM reviews often shorter because the contribution sits in the experimental chapters. Always confirm with your programme handbook — word limits are local.
Example: A MAAS coaching client in a Vietnamese-Australian joint PhD programme assumed "longer is safer" and submitted a 19,000-word review. The panel's feedback was that 40% repeated points already made; cutting to 11,500 words by merging redundant sub-sections raised the chapter's clarity score in the next supervision report.
How do you structure a PhD literature review?
Direct answer: Use a thematic structure, not a chronological or author-by-author one. Organise the chapter around the key debates, concepts or variables in your field, move from the broad context toward your specific gap (a funnel), and end with a synthesis that sets up your research questions. A common spine is: introduction → thematic sections → critical synthesis → identified gap → chapter summary.
Evidence: The "funnel" model is recommended in Ridley's The Literature Review: A Step-by-Step Guide for Students (SAGE, 2012), one of the most used doctoral methods texts in the UK. Thematic organisation is also the default advised by the Thesis Whisperer and most .ac.uk writing centres because it forces synthesis across sources rather than isolated description.
Example: A MAAS student researching EFL teacher motivation built three themes — economic drivers, professional identity, and policy context — and devoted one section to each, comparing how different studies treated the same theme. This made it obvious that no study had examined all three together in the Vietnamese context, which became her stated gap.
How do you find, screen and manage sources without drowning?
Direct answer: Search systematically, screen with explicit criteria, and store everything in a reference manager from day one. Define your search terms, run them across two or three databases (Scopus, Web of Science, ERIC or your field's equivalent), record inclusion/exclusion criteria, and capture every reference in Zotero, Mendeley or EndNote so citations and the bibliography are automatic.
Evidence: The PRISMA framework, though designed for systematic reviews, gives a transparent screening logic — identification, screening, eligibility, inclusion — that doctoral examiners increasingly expect to see described even in narrative reviews. The University of Manchester Library's literature-searching guidance explicitly recommends documenting your search strategy so it is reproducible.
Example: A MAAS Publishing Advisory client tracked 240 hits in a spreadsheet with columns for relevance, method and theme; screening to 68 core sources took two afternoons instead of two weeks, because she was not re-reading abstracts she had already judged. Her reference manager then generated the full Harvard list in seconds.
How do you write critically instead of just summarising?
Direct answer: Critical writing evaluates rather than reports. After stating what a study found, add a sentence that judges it — its method, scope, assumptions, or how it relates to other work. The simplest upgrade is to follow every "X found that…" with "however," "yet," "this is limited by," or "this aligns with Y but contradicts Z." Synthesis across sources, not commentary on one, is what signals doctoral-level critique.
Evidence: The University of Leicester's "critical writing" guidance frames the difference as descriptive (what happened) versus critical (why it matters, how strong the evidence is, what follows). Wallace and Wray's Critical Reading and Writing for Postgraduates (SAGE) gives the "reviewing as argument" template that MAAS mentors teach: claim → evidence → evaluation.
Example: This is the most common gap MAAS sees with Vietnamese candidates, whose prior training often rewarded respectful summary of authorities. One PhD student reframed "Smith (2018) studied X" into "Smith (2018) offers the most cited account of X, but its sample of 30 was drawn entirely from private universities, so its findings may not transfer to Vietnam's public-sector context" — a single added clause that converted description into critique.
How do you identify and frame a research gap?
Direct answer: A gap is a specific, defensible space the existing literature has not addressed — not simply "no one has studied this in Vietnam." Strong gaps come in recognisable types: an unexamined population or context, a methodological limitation across studies, a contradiction between findings, or an untested theoretical assumption. State the gap explicitly and connect it directly to your research questions.
Evidence: Sandberg and Alvesson (2011) in Organization distinguish "gap-spotting" (filling a hole) from "problematisation" (challenging an assumption), and note that examiners reward the latter as more original. Vitae's doctoral guidance similarly stresses that the gap must lead logically into the aims, not appear as an afterthought.
Example: A MAAS student initially wrote "there is a lack of research on this topic in Vietnam," which her examiner called too thin. Reframing it as "existing models of digital adoption were validated in high-income economies and assume reliable infrastructure — an assumption that does not hold in rural Vietnamese provinces" gave her a problematisation-type gap that justified an entirely new study design.
How do you write the review in your own academic voice as an ESL writer?
Direct answer: Yes, you can write in confident academic English as a second-language writer — the key is paraphrasing ideas into your own argument structure rather than stitching together quotations, and using reporting verbs that carry your stance. Read widely in your field to absorb phrasing, draft in your own words, then edit for precision. This also keeps you safely clear of plagiarism.
Evidence: The University of Adelaide's Writing Centre and the Academic Phrasebank (University of Manchester) provide vetted sentence frames — "A number of researchers have argued that…", "This evidence is, however, contested by…" — that ESL doctoral writers can adapt without copying content. Using your own framing language while citing others' ideas is exactly what academic integrity requires.
Example: A MAAS Academic Mentoring client kept a personal "phrase bank" of 40 critical-stance sentence starters drawn from papers in her field. Working through the Outline → Draft → Final model with her mentor, she wrote each section in her own structure first, then refined the English — her supervisor noted a "marked improvement in scholarly voice" within two chapters, with no reliance on copied phrasing.
Frequently asked questions
Should I write the literature review first or last?
Write an early draft first to map the field and find your gap, but expect to revise it last. The review evolves as your study takes shape, and many candidates do a final update before submission to add newly published sources.
How many sources does a PhD literature review need?
There is no fixed number — most cite 100–200 sources, but relevance matters more than count. A focused review that engages deeply with the 60 most important studies is stronger than one that name-drops 300.
Can I include sources in Vietnamese or other languages?
Yes, and you should if they are relevant — local-language scholarship often strengthens the case for studying the Vietnamese context. Cite them in your required style and, if useful, note the original language.
What is the difference between a literature review and a theoretical framework?
The literature review surveys and critiques the whole field; the theoretical framework selects the specific theory or concepts you will use to analyse your data. They are related but distinct chapters.
How do I avoid the review becoming just a summary?
Make every paragraph carry a claim about the field, group sources by theme rather than by author, and always pair "what was found" with "what it means or where it falls short."
Can MAAS coach me through my literature review?
Yes. MAAS Academic Mentoring guides Vietnamese PhD candidates through the review chapter using the Outline → Draft → Final model, with developmental feedback from PhD-level mentors on structure, critical voice and gap framing. Book a consultation through our contact page.
Need a second pair of eyes on your review chapter?
Writing the literature review is where most Vietnamese PhD candidates feel they are working hardest for the least visible progress. With the right structure and an experienced mentor reading each draft, the chapter becomes a clear argument rather than an endless reading list.
Book a literature review mentoring consultation with MAAS Academic Mentoring →
Related guides
- How do you write a theoretical framework for a dissertation? — the chapter your literature review sets up
- How do you prepare for a viva voce defence when English is your second language? — defending the review and gap you argued
- How do you write a methodology section that examiners actually believe? — the chapter that follows your review
- Academic Mentoring service — PhD chapter coaching through the Outline → Draft → Final model
References
- University of Edinburgh — Literature Review (Institute for Academic Development)
- University of Leicester — What is critical writing?
- The University of Manchester — Academic Phrasebank
- Ridley, D. (2012). The Literature Review: A Step-by-Step Guide for Students. SAGE.
- Wallace, M., & Wray, A. (2021). Critical Reading and Writing for Postgraduates. SAGE.
- Sandberg, J., & Alvesson, M. (2011). "Ways of constructing research questions: gap-spotting or problematization?" Organization, 18(1), 23–44.
- PRISMA — Transparent reporting of systematic reviews
This article is part of the MAAS Journal series for Vietnamese international postgraduate students. MAAS Academic Mentoring is an advisory partner — we coach students through the Outline → Draft → Final delivery model with developmental feedback from PhD-level mentors. We do not write or submit work on a student's behalf.