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
duong van » cong van, duong anh
yang jui » yang judy, yang di, yang yi
cong seo » hong seo, cong shu, cong sun
yang xi » yang di, yang yi

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: wang ((yang jui) OR (yang xi)) human gene sang minh ((cong seo) OR (duong van)) ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "wang ((yang jui) OR (yang xi)) human gene sang minh ((cong seo) or (duong van)) ;~".
• Adding a wildcard symbol may retrieve word variants: wang ((yang jui) OR (yang xi)) human gene sang minh ((cong seo) or (duong van)) ;*.