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
zhang kim » zhang xin, zhang i, zhang ii
kang kim » kanaga kim, tan kim, yong kim
gong min » jong min, song min, gong meng

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