Perhaps you should try some spelling variations:
yan yuan » yan guan, fang yuan, nan yan
tan yang » dan yang, tan yong, tao yang
tan ying » fan ying, ran ying, tan yong
yi chang » ii chang, ying chang, jin chang
yin yang » ying yang, yi yang, yin fang
yan yan » nan yan, yang yang, qian yan
wang » wing, wan, lang

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