Perhaps you should try some spelling variations:
yang yang » wang yang, wang yan
lang yan » wang yan, wang yang, zhang yan
yan yuan » yan guan, fang yuan, nan yan
tan yang » dan yang, tan ying, tao yang
tan yong » tan hong, tan kong, tan ying
yan yan » nan yan, wang yan, qian yan
yi yang » yin yang, yi gang, yu yang

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: lang yan yan yuan ((tan yang) OR (tan yong)) ((yi yang) OR (yang yang)) (hai OR hadi) ;~.
• Adding a wildcard symbol may retrieve word variants: lang yan yan yuan ((tan yang) or (tan yong)) ((yi yang) or (yang yang)) (hai or hadi) ;*.