Perhaps you should try some spelling variations:
yang ying » yang yang, yang jing, huang ying
hua gene » human gene, hua ren, hy5 gene
yang min » yang mind, yang jin, yang lin
tang min » chang min, sang minh, yang mind
ying ya » ying yang, yang yao, king yax
hong yu » wong yue
a gene » a genre, a gender, a gentle

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: yang ying ya ((hua gene) OR (a gene)) ((yang min) OR (tang min)) hong yu ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "yang ying ya ((hua gene) OR (a gene)) ((yang min) or (tang min)) hong yu ;~".
• Adding a wildcard symbol may retrieve word variants: yang ying ya ((hua gene) OR (a gene)) ((yang min) or (tang min)) hong yu ;*.