Perhaps you should try some spelling variations:
yan liang » yang liang, wang liang, you liang
yang yang » wang yang, wang yan
tan cheng » tang zheng, yuan cheng, tan hong
cheng ton » cheng boon, chung tong, cheng han
duong van » cong van, duong anh
ton king » tong king, ton kino, john king
kong van » cong van, kong hang, kong land

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: qian ((yan liang) OR (yang yang)) tan cheng ton king ((kong van) OR (duong van)) ;~.
• Adding a wildcard symbol may retrieve word variants: qian ((yan liang) or (yang yang)) tan cheng ton king ((kong van) or (duong van)) ;*.