Perhaps you should try some spelling variations:
wang yang » wang yan, wang liang, wang yanling
yao yang » yang yang
hua gene » human gene, hua ren, hy5 gene
lei ying » li ying, huei ying, hoi ying
ying sar » using sar, kong sar
a gene » a genre, a gender, a gentle
i lei » i levi, i le, i les

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: (wan OR lang) ((yao yang) OR (wang yang)) ((hua gene) OR (a gene)) i lei ying sar ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(wan or lang) ((yao yang) or (wang yang)) ((hua gene) OR (a gene)) i lei ying sar ;~".
• Adding a wildcard symbol may retrieve word variants: (wan or lang) ((yao yang) or (wang yang)) ((hua gene) OR (a gene)) i lei ying sar ;*.