Perhaps you should try some spelling variations:
tuan china » wuhan china, can china, taiwan china
long thanh » luong thanh, long han, truong thanh
long trinh » long trip
guan chia » tan chia
yuan kang » yuan wang, yuan chang, chan kang
kang lin » wang lin, yang lin, huang lin
wang » wing, wan, lang

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 yan ((guan chia) OR (tuan china)) yuan kang lin ((long thanh) OR (long trinh)) ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "wang yan ((guan chia) OR (tuan china)) yuan kang lin ((long thanh) or (long trinh)) ;~".
• Adding a wildcard symbol may retrieve word variants: wang yan ((guan chia) OR (tuan china)) yuan kang lin ((long thanh) or (long trinh)) ;*.