Perhaps you should try some spelling variations:
yidan cheng » yuan cheng
yang yidan » wang yidan
ying yang » yang yang, yin yang, ying chang
dang hari » dang hai
ran ying » fan ying, tan ying, jin ying
yang jie » yang jin, yang jui, yang jun
yang yi » yang jui
yang xi » yang jui

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

• Performing a fuzzy search may retrieve terms with similar spellings: ran ying yang yidan cheng ((((yang jie) or (yang yi))) or (((yang xi) or (yang di)))) dang hari ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ran ying yang yidan cheng ((((yang jie) OR (yang yi))) OR (((yang xi) OR (yang di)))) dang hari ;.
• Adding a wildcard symbol may retrieve word variants: ran ying yang yidan cheng ((((yang jie) or (yang yi))) or (((yang xi) or (yang di)))) dang hari ;*.