Kam–Sui peoples
The Kam–Sui peoples are a group of related ethnic groups in China and neighboring portions of Northern Laos and Vietnam. They are defined as speakers of Kam–Sui languages, which belong linguistically to the Kradai language family, rather than genetically. Kam–Sui of China. Cao Miao people. The Cao Miao people of Guizhou, Hunan and Guangxi Provinces speak a Kam-Sui language called "Mjiuniang", although it is believed that the people are of Hmong–Mien descent. Biao people. Whether or not the Biao people of China are of Kam-Sui descent is an issue of present  debate in the scientific community. They are, however, a Tai ethnic group. Kang people. The Kang people of Yunnan Province (referred to as Tai Khang in Laos) speak a Kam–Sui language, but ethnically descend from the Dai people. Kam–Sui of Vietnam. The following Kam–Sui ethnic groups originating in China have population clusters in Vietnam: Tai Khang people of Laos. The Tai Khang people of Laos (referred to as Kang in China) speak a Kam–Sui language, but ethnically descend from the Dai people.