Perhaps you should try some spelling variations:
wang yang » wang yan, wang liang, wang yanling
thanh van » thanh dam, thanh vu
chen dang » chen yang, chen wang, chen dung
yuan hui » yuan fei, jaan hui, tuan hua
dang thi » dang hai
thi mong » thi hong, thi minh
mong hui » tong hui, gong hui, tong shui

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: wang yang ((thanh van) or (yuan hui)) chen dang thi mong hui ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: wang yang ((thanh van) OR (yuan hui)) chen dang thi mong hui ;*.