Perhaps you should try some spelling variations:
human gene » human genome, human gender, human bone
dong cao » dong xiao, dan cao, dong nan
hua gene » a gene, hua ren, hy5 gene
jiu long » jiu cong, au long, eu long
long shu » cong shu, tong shui, long du
yan jiu » yang jie, yang jin, pang jiu
sin » sign, sind, skin

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

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