20 in Viet Nam (Ferlus 1996). Population total all countries: 40. Ethnic population: 100 in Viet Nam (Ferlus 1996).
Quang Binh Province, Bo Trach district, Tan Trach, 1 or 2 families of Thuong Trach. Also in Laos.
8b (Nearly extinct).
Other dialects or ethnic names: Tu-vang, Pa-leng, Xo-lang, To-hung, Chà-cu, Tac-cui, Nhà Chút.
Also use Vietnamese [vie].
Part of Chút official ethnic community, including Sách, Mày Ruc, and Arem.