Mandarin Chinese → Vietnamese
Vietnamese uses 35 sounds. You already own 19 of them from Mandarin Chinese. The other 16 are the work — and 14 of those are the dangerous kind: close enough to something you already say that you will substitute them without hearing yourself do it.
The silent swaps
Your mouth has something close enough to reach for. These survive for years precisely because they sound right to you — the fix is hearing the difference first, not trying harder.
the move: close, but not identical
Vietnamese: to weigh; a kilo · written "â"
A SHORT ơ: cân is clipped, cơn is held. The vowel of American 'cut', or a short Korean ㅓ.
Your /ɤ/ is the one in hē 喝 (to drink).
the move: close, but not identical
Vietnamese: to eat · written "ă", "a (in ay, au)"
A SHORT a. Written ă on its own, but the a of tay and sáu is this vowel too — which is why tai/tay and sao/sáu are different words.
Your /a/ is the one in mǎ 马 (horse).
the move: velar → palatal
Vietnamese: hello / goodbye · written "ch", "tr (Hanoi)"
A stop made with the tongue body on the palate; there is no 'sh' after it. Close to Korean ㅈ but tighter and with no hiss. tr merges into it in Hanoi (the south says a retroflex /ʈ/).
Your /k/ is the one in gǒu 狗 (dog).
the move: velar → palatal
Vietnamese: house · written "nh"
Spanish ñ. Also a final: anh, bánh.
Your /ŋ/ is the one in máng 忙 (busy).
the move: unrounded
Vietnamese: letter · written "ư"
Say /u/, then unround the lips and keep the tongue where it was. The horn on the letter means 'unrounded'. This is Korean ㅡ (eu), exactly — a Korean speaker owns it already.
Your /u/ is the one in wǔ 五 (five).
the move: retroflex → velar
Vietnamese: chicken · written "g", "gh"
A voiced fricative, like Spanish g between vowels — softer than English g. gh before e/ê/i.
Your /ʐ/ is the one in rén 人 (person).
the move: voiced
Vietnamese: happy, fun · written "v"
Hanoi /v/; the south says /j/, so vui sounds like 'yui'.
Your /f/ is the one in fàn 饭 (rice / meal).
the move: voiced
Vietnamese: yes (polite) · written "d", "gi", "r (Hanoi)"
Three spellings, one Hanoi sound. The south says d and gi as /j/ and r as /ʐ/ or a trill, and keeps all three apart in writing.
Your /s/ is the one in sān 三 (three).
the move: open-mid → close-mid
Vietnamese: night · written "ê"
Closed e — French é, Korean ㅔ, the vowel of American 'say' without the glide. The hat makes it closed.
Your /ɛ/ is the one in xiè 谢 (thanks).
the move: close-mid → open-mid
Vietnamese: to give; for · written "o"
Open o — the vowel of 'law' for an American who keeps caught apart from cot, shorter. Korean has nothing between ㅗ and ㅓ; this sits between them.
Your /o/ is the one in wǒ 我 (I).
the move: it glides, yours would hold still
Vietnamese: money · written "ia", "iê", "ya", "yê"
One diphthong, spelled ia when nothing follows (kia) and iê when a consonant does (tiền).
Your /i/ is the one in yī 一 (one).
the move: it glides, yours would hold still
Vietnamese: to buy · written "ua", "uô"
ua when final (mua), uô before a consonant (muốn). After q the u belongs to the consonant: qua is /kwa/.
Your /u/ is the one in wǔ 五 (five).
the move: voiced
Vietnamese: three; father · written "b"
Implosive: the larynx drops and air is drawn in as the lips open. A plain English b is understood, but sounds foreign. New for Korean speakers too — Korean ㅂ is neither voiced nor implosive.
Your /p/ is the one in bā 八 (eight).
Words you may say identically
Two or more Vietnamese sounds landing on one sound of yours. Until the ear separates them, the mouth cannot — which is what the ear trainer is for.
- ɯ = u = uə → your u vs vs train this pair →
- ɓ = p → your p vs
- ɗ = t → your t vs
- c = k → your k vs train this pair →
- ɲ = ŋ → your ŋ vs
- f = v → your f vs
- s = z → your s vs
- i = iə → your i vs
- e = ɛ → your ɛ vs train this pair →
- ɤ = ɤ̆ → your ɤ vs train this pair →
- a = ă → your a vs train this pair →
- o = ɔ → your o vs train this pair →
Genuinely new
Nothing in Mandarin Chinese sits close to these. They sound foreign in your mouth — which is the good news: you can hear that you are not saying them yet.
Rhythm and pitch
The layer spelling never records, and the one that makes a correct sentence still sound foreign.
| Mandarin Chinese | Vietnamese | |
|---|---|---|
| Rhythm | Syllable-timed | Syllable-timed, one tone per syllable |
| Stress | Stress is a matter of length and clarity rather than pitch: a stressed syllable holds its full tone, an unstressed one goes neutral and short. | No lexical stress. Every syllable carries its own tone and its own full vowel, and none is reduced. What sounds like stress to an English ear is a syllable holding its tone longer or louder for emphasis, and grammatical words (đã, sẽ, được) being said lighter and faster than content words. |
What you have that Vietnamese doesn't
23 sounds with no job in Vietnamese. They are not mistakes — but they are where an accent leaks in, because a sound you own is easy to use when a hard one is due.
The honest caveat
This is a prediction from the shape of two sound systems, not a recording of you. It says what your inventory makes likely — it cannot know that your Mandarin Chinese has a regional variety that already owns one of these, or that you learned Vietnamese from someone whose accent you copied. A teacher listening to you beats it. Use it to know what to listen for.
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