Perhaps you should try some spelling variations:
tuan china » wuhan china, can china, taiwan china
thanh van » thanh dam, thanh vu
jun zhang » bin zhang, jia zhang, jie zhang
zhang hai » zhang dai, shang hai, zhang han
wing tan » wing ian, liang tan, hong tan
tan yang » dan yang, tan ying, tan yong
yang jun » yang jui, pang jun, yang jin

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: wing tan ((thanh van) OR (tuan china)) tan yang jun zhang hai ;~.
• Adding a wildcard symbol may retrieve word variants: wing tan ((thanh van) or (tuan china)) tan yang jun zhang hai ;*.