Perhaps you should try some spelling variations:
zhang ming » zhang xin
van thanh » tran thanh, phan thanh, lam thanh
thanh van » thanh dam, thanh vu
van zhang » yan zhang, bin zhang, hao zhang
gong meng » gong gang
wang van » wang yan, wang ban, wang dan
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 van thanh van zhang ((kang kim) OR (zhang ming)) ((gong min) OR (gong meng)) ;~.
• Adding a wildcard symbol may retrieve word variants: wang van thanh van zhang ((kang kim) or (zhang ming)) ((gong min) or (gong meng)) ;*.