Perhaps you should try some spelling variations:
wang yidan » wang yan
yidan yang » dan yang, yin yang
tran thanh » tran trang
tan ying » ran ying, tan yang, tan yong
fan ying » fan xing, ran ying, jin ying
yang yi » yang di, yang xi, yang jui
yu tran » you train, duc tran, eu trans

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 yidan yang yi ((((tan ying) OR (fan ying))) OR (du yang)) yu tran thanh ;~.
• Adding a wildcard symbol may retrieve word variants: wang yidan yang yi ((((tan ying) or (fan ying))) or (du yang)) yu tran thanh ;*.