Perhaps you should try some spelling variations:
human gene » human genome, human gender, human bone
yi human » i human, ii human, 2 human
gene anh » gene bank, gene one
anh ming » anh minh, wan ming
congo a » congo _, congo 1, congo 2
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.

• Performing a fuzzy search may retrieve terms with similar spellings: wang yan yi human gene anh ming ((cong shu) or (congo a)) ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: wang yan yi human gene anh ming ((cong shu) OR (congo a)) ;.
• Adding a wildcard symbol may retrieve word variants: wang yan yi human gene anh ming ((cong shu) or (congo a)) ;*.