How come the diaspora Asian community opens the same business no matter where they live?

In America, Vietnamese people usually own nail salons and spas. In London, I saw several nail salons owned and operated by Vietnamese people. Even in France. My Vietnamese aunt lives in France, and she works at a nail salon owned by a Vietnamese woman. For Chinese people, it's foot massage parlors. You can find countless foot massage parlors owned by Chinese people in American Chinatowns and in European countries. Why do they open the same business, regardless of what country they live in?

How come the diaspora Asian community opens the same business no matter where they live?
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