Why Vietnamese Learners Often Pass the JLPT Faster (and Where They Still Struggle)
Vietnamese students often surprise newcomers with how quickly they absorb Japanese vocabulary. It isn’t luck. There is a real linguistic reason. But the same students hit a grammar wall that others don’t. Here is an honest look at both sides.
The Big Advantage: Hán-Việt
A large share of Vietnamese vocabulary comes from Chinese roots, the Hán-Việt (漢越語) layer, and so does Japanese 漢語 (kango, the on’yomi compound words). That means many Japanese words have a Vietnamese cousin that sounds and means almost the same.
Once a Vietnamese learner notices this pattern, kanji compounds stop feeling random. The on’yomi often “rhymes” with a word they have known since childhood, so N5–N3 vocabulary builds fast.
Cognate Examples
| Japanese (kango) | Hán-Việt | Meaning |
|---|---|---|
| 注意（ちゅうい） | chú ý | attention / caution |
| 自由（じゆう） | tự do | freedom |
| 安全（あんぜん） | an toàn | safety |
| 準備（じゅんび） | chuẩn bị | preparation |
| 時間（じかん） | thời gian | time |
| 意見（いけん） | ý kiến | opinion |
| 文化（ぶんか） | văn hóa | culture |
| 歴史（れきし） | lịch sử | history |
| 銀行（ぎんこう） | ngân hàng | bank |
| 結婚（けっこん） | kết hôn | marriage |
Where the Cognate Advantage Breaks Down
Not every Hán-Việt pair lines up as cleanly as the table above suggests. Centuries of separate development mean some words have drifted in meaning, and some Japanese kango simply don't have an actively used Hán-Việt counterpart in modern Vietnamese, or vice versa. Treat the bridge as a strong first guess, not a guarantee, especially for less common words.
The other limit is order. Japanese and Vietnamese sometimes reverse the order of the two syllables within a compound relative to each other, so the resemblance is there in the sounds but not in a word-for-word left-to-right match. Recognizing the cognate still helps enormously; just don't expect a mechanical one-to-one translation every time.
Kun'yomi Words Don't Get the Boost
The Hán-Việt bridge only applies to on'yomi vocabulary, the kango words borrowed from Chinese. Native Japanese words read with kun'yomi, things like 食べる, 大きい, or 走る, have no Chinese root and therefore no Vietnamese cognate to lean on. These have to be learned the same way every other learner learns them: through repetition and context.
This matters for planning your study time. If your vocabulary feels lopsided, strong on formal or academic kango but shaky on everyday verbs and adjectives, that is not a sign of a gap in your ability. It is the direct, predictable result of where the cognate advantage does and does not apply.
A Practical Drill
When you meet a new kango word, pause for three seconds and try to produce its Hán-Việt reading before checking the Japanese meaning. If a Hán-Việt word comes to mind and it resembles the on'yomi, you have effectively already learned the word; you just need to attach the specific kanji and reading to a concept you already own.
Keep a running list of the kango where this trick failed you, words where no Hán-Việt cognate came to mind. That list is your genuine new-vocabulary workload, separate from the words the cognate bridge is handling for free, and it is a much more honest way to track your real progress than counting total words studied.
Where Vietnamese Learners Still Struggle
The advantage is in words, not in grammar. Vietnamese and Japanese are structurally very different, and that is where the same difficulties repeat.
Word order & particles
Vietnamese is SVO and analytic, with no case particles. Japanese is SOV and leans entirely on は・が・を・に・で. Learning which particle to use, and the は/が distinction, takes real effort.
Verb conjugation
Vietnamese verbs don’t conjugate. So ます形 / て形 / plain form / potential are all brand new. I always slow down and teach the verb groups carefully here.
Vowel length & small っ
Vietnamese has its own rich sound system, but Japanese length distinctions (おばさん vs おばあさん, きて vs きって) still need dedicated ear training.
Keigo (敬語)
Vietnamese politeness works largely through pronouns and address terms; Japanese does it through verb forms (尊敬語・謙譲語). The mapping is not one-to-one.
My Advice for Vietnamese Learners
- Lean hard on the Hán-Việt bridge for kanji and vocabulary. It is your superpower. When you meet a new 漢語, ask “what is the Hán-Việt?”
- But spend your study hours on grammar, particles, and conjugation, because that is where points are actually lost. Don’t let easy vocabulary fool you into neglecting grammar.
- Treat listening length and contractions as a separate skill. Train your ears a little every day.
Teacher’s Note
Used well, the Hán-Việt advantage can carry you through N5 and N4 quickly, provided your grammar keeps pace so N3 doesn’t catch you off guard. The learners I see stall at N3 are almost always the ones who coasted on vocabulary and skipped grammar drills.
Explanations in your language
Nihongo Pass explains grammar and vocabulary in Vietnamese, so you understand why, not just what. Built by a JLPT N1 teacher.