There are 3 dipthongs

[Hiền Chi]

1. /u͜o/ is written with 2 letters: ua, uô-
+) "ua" is written in a syllable which has no final sounds: chua, mua, cua,....
+) " uô-" is written in a syllable which has final sounds: muốn, chuối, thuốc,...
2. /ɯ͜ɤ/ is written with 2 letters: ưa, ươ-
+) "ưa" is written in a syllable which has no final sounds: chữa, mưa, cửa,....
+) " ươ-" is written in a syllable which has final sounds: người, cười, được,...
3. /i͜e/ is written with 4 letters: iê-, yê-, -ya, ia
+) "ia" is written in a syllable which has no final sounds: mía, bia, kia,....
+) " iê-" is written in a syllable which has final sounds: tiền, tiếng, Việt,...
+) "-ya" is written in a syllable which has semi- vowel u and no final sounds: khuya.
+) " -yê-" is written in a syllable which has semi- vowel u and final sounds: huyền, tuyết,...


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