While that is true to a large extent, there was significant settlement sometime during the expansion of the Vietnamese dynasties since the 15th century where they expropriated originally Khmer and Cham lands to Kinh and Chinese settlers. Many of whom intermarried with the Khmer and Cham populations of central-southern Vietnam. This is why ethnic Kinh from northern Vietnam can look quite northeastern Asian while a lot of ethnic Kinh from southern and central Vietnam tend look closer to Filipinos and Thais, although many individuals can have intermediate features between east Asian and southeast Asian.
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