Perhaps you should try some spelling variations:
human gene » human genome, human gender, human bone
gene sang » lee sang, gene bank
sang minh » kang minah, anh minh, song min
cong seo » hong seo, cong shu, cong sun
cong van » congo can, duong van, cong sun
yang xi » yang di, yang jui
yang yi » yang di, yang jui

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: yang ((yang xi) OR (yang yi)) human gene sang minh ((cong seo) OR (cong van)) ;~.
• Adding a wildcard symbol may retrieve word variants: yang ((yang xi) or (yang yi)) human gene sang minh ((cong seo) or (cong van)) ;*.