Perhaps you should try some spelling variations:
tuan china » wuhan china, can china, taiwan china
long trip » longer trip, long tail, longer trips
trip tuan » trip quand
yang july » yang judy, yang jun
yang jui » yang judy, yang di, yang xi
yang yi » yang di, yang xi
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: long trip tuan china a ((((yang jui) OR (yang yi))) OR (yang july)) wang hua ;~.
• Adding a wildcard symbol may retrieve word variants: long trip tuan china a ((((yang jui) or (yang yi))) or (yang july)) wang hua ;*.