Perhaps you should try some spelling variations:
fang sudan » fang sidun, fang yuan, fund sudan
sudan chen » sudan ch
long trip » longer trip, long tail, longer trips
chen you » when you, chen yu, chen yulu
you gain » you can
tang yun » yang yun, chang yun, fang yuan
yang yue » wang yue, yang yun, yang jui
yang yi » yang xi, yang jui

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: fang sudan chen you gain ((((((tang yun) OR (yang yue))) OR (yang yi))) OR (yang di)) long trip ;~.
• Adding a wildcard symbol may retrieve word variants: fang sudan chen you gain ((((((tang yun) or (yang yue))) or (yang yi))) or (yang di)) long trip ;*.