Perhaps you should try some spelling variations:
yang ying » yang jing, huang ying, liang ying
yang yang » wang yang, wang yan
zhong tai » hong tan, hong hai, zhong zhi
iii gene » iii rene, iii gender, iii genome
gene tan » gene bank
tan tan » tas tan, tin tan, tang tang
hong 7 » hong w, hong a, hong g

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 ((yang ying) OR (yang yang)) iii gene tan tan ((zhong tai) OR (hong 7)) ;~.
• Adding a wildcard symbol may retrieve word variants: wang ((yang ying) or (yang yang)) iii gene tan tan ((zhong tai) or (hong 7)) ;*.