Perhaps you should try some spelling variations:
human gene » human genome, human gender, human bone
sheng jie » shang jin, sheng jou, sheng qi
lang yan » wang yan, wang yang, zhang yan
hua gene » hua ren, hy5 gene
jie song » jae song, jin song, kim song
song shu » cong shu, song shin, tong shui
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: lang yan yan ((((hua gene) or (a gene))) or (human gene)) sheng jie song shu ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: lang yan yan ((((hua gene) OR (a gene))) OR (human gene)) sheng jie song shu ;.
• Adding a wildcard symbol may retrieve word variants: lang yan yan ((((hua gene) or (a gene))) or (human gene)) sheng jie song shu ;*.