Perhaps you should try some spelling variations:
human gene » human genome, human gender, human bone
yang yang » wang yang, wang yan
gene sang » lee sang, gene bank
sang minh » kang minah, anh minh, song min
duong van » cong van, duong anh
cong seo » hong seo, cong shu, cong sun
i human » 2 human, 3 human, 1 human
yang i » yang di, yang xi, yang yi

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

• Performing a fuzzy search may retrieve terms with similar spellings: yang yang i human gene sang minh ((cong seo) or (duong van)) ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: yang yang i human gene sang minh ((cong seo) OR (duong van)) ;.
• Adding a wildcard symbol may retrieve word variants: yang yang i human gene sang minh ((cong seo) or (duong van)) ;*.