Perhaps you should try some spelling variations:
yang guang » yan guan, yang liang
wang yang » wang yan, wang liang, wang yanling
yang yang » wang yan
thanh vu » thanh van, thanh _
wei yang » pei yang, wei wang, wei yang's
yang kim » yong kim, kang kim, hyung kim
kim wang » kim kwang, kim jang, kim eung
wang hui » wang hua, wang zhi, wang wei

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: ((((wang yang) OR (yang yang))) OR (yang guang)) ((ya hua) OR (thanh vu)) wei yang kim wang hui ;~.
• Adding a wildcard symbol may retrieve word variants: ((((wang yang) or (yang yang))) or (yang guang)) ((ya hua) or (thanh vu)) wei yang kim wang hui ;*.