Perhaps you should try some spelling variations:
longer trip » longer trips
truong tran » truong thanh, truong xuan, tung tran
qian wang » yiqian wang, qian rong, qian yan
long trip » long tail, longer trips
hong paul » ron paul
zhi qing » he qing, shi ding, shi ling
yan zhi » yan zi, wang zhi

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: qian wang yan zhi qing ((truong tran) OR (((longer trip) OR (long trip)))) hong paul ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "qian wang yan zhi qing ((truong tran) or (((longer trip) OR (long trip)))) hong paul ;~".
• Adding a wildcard symbol may retrieve word variants: qian wang yan zhi qing ((truong tran) or (((longer trip) OR (long trip)))) hong paul ;*.