Since before the Han conquest of Southern China the Zhuangs conquered the Viets is it possible that the Zhuangs assimilate the Viets completely, and what would be it's consqequences on the history of South East Asia.
http://en.wikipedia.org/wiki/Âu_ViệtThe Âu Việt were also referred to the Kingdom of East Ou (東甌), descendants of the Yue (state) moved to Fujian after its fall, and the West Ou (西甌; Chinese: Xī Ōu; Tây meaning "western"). The West Ou were considered to be one of the Bǎiyuè tribes. They had short hair and tattoos, and blackened their teeth.[1] They are considered to have been the ancestors of the upland Tai-speaking minority groups in Vietnam such as the Nung and Tay,[2][3] as well as the closely related Zhuang people of Guangxi.
The Âu Việt traded with the Lạc Việt, the inhabitants of the state of Văn Lang, which was located in the lowland plains to Âu Việt's south, in what is today the Red River Delta of northern Vietnam, until 258 BC or 257 BC, when Thục Phán, the leader of the alliance of Âu Việt tribes, invaded Văn Lang and defeated the last Hùng Vương. He named the new nation "Âu Lạc," and proclaiming himself king An Dương Vương.[1]