Perhaps you should try some spelling variations:
tuan china » wuhan china, can china, taiwan china
yang july » yang judy, yang jui, yang jun
zhang han » zhang fan, zhang yan, zhang hanmo
thanh vu » thanh van, thanh _
tan chia » than china, can china, dan china
tan yang » dan yang, tan ying, tan yong
hong » long

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: hong tan ((thanh vu) OR (((tan chia) OR (tuan china)))) tan yang july zhang han ;~.
• Adding a wildcard symbol may retrieve word variants: hong tan ((thanh vu) or (((tan chia) or (tuan china)))) tan yang july zhang han ;*.