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Especially Bui Tien Dung's. There are 3 of them. 2 of them has same name, and other one has same name with different characters in Vietnamese. Really confusing language, really confusing names.

It is difficult for foreigners to remember their names and the right people. Because they have nearly identical names. And they are also siblings

Hahah I didn't know they were siblings. They have really interesting parents then, always using same name.