Since the API doesn't support discovery by country yet see here: https://www.themoviedb.org/talk/56dfdf2692514125cd002054
Also if you are interested in Vietnamese cinema:
Great Directors:
Tran Anh Hung
Victor Vu
Charlie Nguyen
Ngoc Dang Vu
Dang Nhat Minh
Great Actors:
Thai Hoa
Also see here:
http://www.imdb.com/country/vdvn
http://www.imdb.com/country/vn
https://mubi.com/lists/vietnamese-cinema
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Une liste de balrok