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
china aus » china als, china auf, china aids
yang july » yang judy, yang jun
yang jui » yang judy, yang di, yang yi
wing hua » wang hua, ying hua, dong hua
ming hua » ying hua, ming hung, wang hua
yang xi » yang di, yang yi

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 aus ((((yang jui) OR (yang xi))) OR (yang july)) ((wing hua) OR (ming hua)) ;~.
• Adding a wildcard symbol may retrieve word variants: long trip tuan china aus ((((yang jui) or (yang xi))) or (yang july)) ((wing hua) or (ming hua)) ;*.