I think and believe that I am an East Asian .
I've browsed to find out which DNA test(s) is(/are) suitable for East Asians but I have not found one yet.
Can you help me?
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You do not say whether you have considered AncestryDNA but the autosomal DNA test available from that company can be used to look for East Asian Ethnicity:
People in this DNA ethnicity group may identify as: Russian, Chinese, North Korean, South Korean, Mongolian, Vietnamese, Burmese (from Myanmar), Japanese, Taiwanese, Filipino, Indonesian, Thai, Laotian, Cambodian, Singaporean, Bruneian, Palauan