Perhaps you should try some spelling variations:
wang yidan » wang yan
yidan yang » dan yang, yin yang
van thanh » tran thanh, phan thanh, lam thanh
tan ying » ran ying, tan yong, tan hong
tan yang » dan yang, tan yong, tao yang
fan ying » fan xing, ran ying, jin ying
yang yi » yang di, yang xi, yang jui

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 (tan yang))) OR (fan ying))) OR (du yang)) yu van thanh ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "wang yidan yang yi ((((((tan ying) OR (tan yang))) or (fan ying))) or (du yang)) yu van thanh ;~".
• Adding a wildcard symbol may retrieve word variants: wang yidan yang yi ((((((tan ying) OR (tan yang))) or (fan ying))) or (du yang)) yu van thanh ;*.