Tày or Thổ (a name shared with the unrelated Thổ and Cuoi languages) is the major Tai language of Vietnam, spoken by more than a million Tày people in Northeastern Vietnam.
There are also three semivowels [u̯i̯ɯ̯] that mainly occur in syllable-coda position in combination with other vowel sounds. [u̯i̯] are typically realized as consonant sounds [wj]. [u̯] follows front vowels /ieɛ/ and central vowels /əaɐ/. [i̯] follows back vowels /uoɔ/ as well as central vowels /əaɐ/. However, [ɯ̯] only follows /ə/.[4]
^Edmondson, Jerold A.; Solnit, David B., eds. (1997). Comparative Kadai: The Tai Branch. Dallas: Summer Institute of Linguistics and the University of Texas at Arlington.
^Văn Ma, Hoàng (1997). "The Sound System of The Tày Language of Cao Bắng Province, Vietnam". In Edmondson, Jerold A.; Solnit, David B. (eds.). Comparative Kadai: The Tai branch. Dallas: Summer Institute of Linguistics and the University of Texas at Arlington. pp. 221–231.