Perhaps you should try some spelling variations:
yang thanh » long thanh, van thanh
zhang ming » zhang xin
wang yang » wang yan, wang liang, wang yanling
thanh van » thanh dam, thanh vu
van zhang » yan zhang, bin zhang, hao zhang
gong meng » gong gang
kang kim » kanaga kim, tan kim, yong kim
gong min » jong min, song min, song ming

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 thanh van zhang ((kang kim) OR (zhang ming)) ((gong min) OR (gong meng)) ;~.
• Adding a wildcard symbol may retrieve word variants: wang yang thanh van zhang ((kang kim) or (zhang ming)) ((gong min) or (gong meng)) ;*.