Perhaps you should try some spelling variations:
wang yuhan » wang luhang, wang yan, wang yidan
yang guang » yang yang, yan guan, yang liang
duong van » cong van, duong anh
tang wing » tang min, tang tang
wing tan » wing ian, liang tan, hong tan
hong sin » dong sin, hong rina, hong song
dong di » dong sin

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

• If you are trying to use Boolean operators, they must be ALL CAPS: ((duong van) OR (dong di)) ((yang guang) OR (wang yuhan)) tang wing tan hong sin ;~.
• Adding a wildcard symbol may retrieve word variants: ((duong van) or (dong di)) ((yang guang) or (wang yuhan)) tang wing tan hong sin ;*.