Perhaps you should try some spelling variations:
tuan china » wuhan china, can china, taiwan china
china dan » china den, china data, china des
shang hai » shang kai, dang hai, chang ha
wang anh » dang anh, wang yang, wang yan
anh tuan » anh tran, dinh tuan, oanh tran
dan yang » daun yang, tan yang, wang yang
yang lin » yang jin, wang lin, yang li

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 anh tuan china dan yang lin ((hong tan) OR (shang hai)) ;~.
• Adding a wildcard symbol may retrieve word variants: wang anh tuan china dan yang lin ((hong tan) or (shang hai)) ;*.