Perhaps you should try some spelling variations:
yang yang » wang yang, wang yan
tan yang » dan yang, tan ying, tan yong
yang jin » yang jie, yang jun, ying jin
ai test » api test, ii test, ein test
yang li » yang lin, yang di, yang xi
hong yu » wong yue
i test » i testi, ii test, 2 test

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tan yang) or (yang yang)) wang ((ai test) OR (i test)) ((yang jin) or (yang li)) hong yu ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tan yang) OR (yang yang)) wang ((ai test) OR (i test)) ((yang jin) OR (yang li)) hong yu ;.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tan yang) or (yang yang)) wang ((ai test) OR (i test)) ((yang jin) or (yang li)) hong yu ;".
• Adding a wildcard symbol may retrieve word variants: ((tan yang) or (yang yang)) wang ((ai test) OR (i test)) ((yang jin) or (yang li)) hong yu ;*.