| Diphthongs | Orthography | Examples | Pronunciation | |
|---|---|---|---|---|
| iə | -ia | thìa | /tʰiə32/ | ‘spoon’ |
| -ya | khuya | /xwiə33/ | ‘late at night’ | |
| -iê- | tiêm | /tiəm33/ | ‘to inject’ | |
| ɯə | -ưa | mưa | /mɯə33/ | ‘to rain’ |
| -ươ- | lươn | /lɯən33/ | ‘eel’ | |
| uə | -ua | thua | /tʰuə33/ | ‘to lose’ |
| -uô- | thuốc | /tʰuək45/ | ‘medicine’ |