They should identify themselves as Vietnamese since they speak Vietnamese and live in Vietnam. Cantonese is a dialect, and can be spoken by people of different nationalities.
Not so logic. Ethnic Chinese in the US have lived there for more than 100 years and most now speak English only. Will they still be registered as ethnic Chinese if immigrating to Singapore?
In addition, it is worth to mention that most mainstream ethnic Hoa groups in Vietnam now speak Vietnamese only (at least from what I can observe).
Last edited: