Spanish → Vietnamese
Vietnamese uses 35 sounds. You already own 18 of them from Spanish. The other 17 are the work — and 15 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 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 casa (house).
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 queso (cheese).
the move: palatal → velar
Vietnamese: delicious · written "ng", "ngh"
English and Korean have this sound only at the end of a syllable (sing, 강); Vietnamese puts it at the start. Say 'sing on', then drop the 'si'. ngh is the same sound before e/ê/i.
Your /ɲ/ is the one in año (year).
the move: bilabial → labiodental
Vietnamese: happy, fun · written "v"
Hanoi /v/; the south says /j/, so vui sounds like 'yui'.
Your /β/ is the one in haber (to have).
the move: dental → alveolar
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 /ð/ is the one in nada (nothing).
the move: close, but not identical
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 /b/ is the one in vaca (cow).
the move: close, but not identical
Vietnamese: to go · written "đ"
The barred đ is the ONLY d-sound in Vietnamese; the unbarred d is /z/ (or /j/ in the south).
Your /d/ is the one in dedo (finger).
the move: aspirated
Vietnamese: to like · written "th"
th is an aspirated t — never English th. thích rhymes with English 'tick', and th is exactly Korean ㅌ against the plain t of ㄸ; a Korean speaker hears this pair without trying.
Your /t/ is the one in todo (all).
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 luz (light).
the move: unrounded
Vietnamese: cooked rice; a meal · written "ơ"
Say /o/ and unround the lips — the same horn, same instruction. Close to Korean ㅓ (eo), and to American 'bird' with the r taken out.
Your /o/ is the one in oso (bear).
the move: unrounded
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 /o/ is the one in oso (bear).
the move: open → open-mid
Vietnamese: mother · written "e"
Open e — French è, the e of American 'bed'. Korean ㅐ as it was before Seoul merged it into ㅔ: Vietnamese still keeps the two apart, so mẹ 'mother' and mê 'to be entranced' are different words.
Your /a/ is the one in casa (house).
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 oso (bear).
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 sí (yes).
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.
Genuinely new
Nothing in Spanish 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.
| Spanish | Vietnamese | |
|---|---|---|
| Rhythm | Syllable-timed | Syllable-timed, one tone per syllable |
| Stress | Fully contrastive, and mercifully written: if a word breaks the default pattern (stress on the second-to-last syllable for vowel/-n/-s endings, on the last otherwise) it carries an accent. Three-way minimal sets are common and the accent is the only thing separating them. | 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. |
| Pitch | No lexical tone. Intonation marks questions, helped by the opening ¿ so you know a rise is coming before you start reading aloud. | lexical tone — pitch changes the word |
What you have that Vietnamese doesn't
9 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 Spanish 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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