Perhaps you should try some spelling variations:
human gene » human genome, human gender, human bone
sheng jie » shang jin, sheng jou, sheng qi
wing yan » wang yan, wing ian, wing tan
hua gene » hua ren, hy5 gene
song shu » song shin, tong shui, wong shiu
yan yan » yan yuan, nan yan, yang yang
a gene » a genre, a gender, a gentle

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: wing yan yan ((((hua gene) or (a gene))) or (human gene)) sheng jie ((song shu) OR (cong shu)) ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: wing yan yan ((((hua gene) OR (a gene))) OR (human gene)) sheng jie ((song shu) OR (cong shu)) ;.
• The words AND, OR and NOT may confuse the search; try adding quotes: "wing yan yan ((((hua gene) or (a gene))) or (human gene)) sheng jie ((song shu) OR (cong shu)) ;".
• Adding a wildcard symbol may retrieve word variants: wing yan yan ((((hua gene) or (a gene))) or (human gene)) sheng jie ((song shu) OR (cong shu)) ;*.