Perhaps you should try some spelling variations:
hua gene » human gene, hua ren, hy5 gene
yang jun » pang jun, yang jin, yang judy
yang jui » yang judy, yang di, yang xi
hong whi » hong ghi, hong hai
wan yan » wang yan, nan yan, wai yan
yan yi » yang yi, tan yi, yan zi
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: wan yan yi ((hua gene) OR (a gene)) ((yang jun) OR (yang jui)) ((hong w) OR (hong whi)) ;~.
• Adding a wildcard symbol may retrieve word variants: wan yan yi ((hua gene) or (a gene)) ((yang jun) or (yang jui)) ((hong w) or (hong whi)) ;*.