Perhaps you should try some spelling variations:
than china » tuan china, han china, wuhan china
yang yang » wang yang, wang yan
yan wang » yuan wang, qian wang, yan liang
tan hua » tuan hua, wang hua, tan chia
pei yun » lei kyun, mei yung, pei yang
yun yao » yul yao, yang yao, youn yeo
long du » long d, long run, long did
long do » long d, longer do, long ago

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((yan wang) or (yang yang)) ((tan hua) or (than china)) pei yun yao ((long du) OR (long do)) ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((yan wang) OR (yang yang)) ((tan hua) OR (than china)) pei yun yao ((long du) OR (long do)) ;.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((yan wang) or (yang yang)) ((tan hua) or (than china)) pei yun yao ((long du) OR (long do)) ;".
• Adding a wildcard symbol may retrieve word variants: ((yan wang) or (yang yang)) ((tan hua) or (than china)) pei yun yao ((long du) OR (long do)) ;*.