Perhaps you should try some spelling variations:
china past » china 21st
tuan china » wuhan china, can china, taiwan china
yang yang » wang yang, wang yan
yan guan » gan guan, yan yuan, yang guang
long ao » long ago, long do, long arm
yang d » yang di, yang du, yang _
yang 4 » yang 47, yang _, yang 8
long a » along a, long _, long 2

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: ((yang yang) OR (yan guan)) tuan china past ((yang d) OR (yang 4)) ((long ao) OR (long a)) ;~.
• Adding a wildcard symbol may retrieve word variants: ((yang yang) or (yan guan)) tuan china past ((yang d) or (yang 4)) ((long ao) or (long a)) ;*.