Perhaps you should try some spelling variations:
human gene » human genome, human gender, human bone
zhong zhi » zhang zhi, hong ghi, zhong tai
hua gene » a gene, hua ren, hy5 gene
yang jun » yang jui, pang jun, yang jin
yuan zi » yan zi, yuan li, yuan fei
yan yi » yang yi, tan yi, yan zi
wang » wing, wan, lang

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 ((yan yi) OR (yuan zi)) ((hua gene) OR (human gene)) yang jun ((hong w) OR (zhong zhi)) ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "wang ((yan yi) or (yuan zi)) ((hua gene) OR (human gene)) yang jun ((hong w) or (zhong zhi)) ;~".
• Adding a wildcard symbol may retrieve word variants: wang ((yan yi) or (yuan zi)) ((hua gene) OR (human gene)) yang jun ((hong w) or (zhong zhi)) ;*.