Perhaps you should try some spelling variations:
yang yang » wang yang, wang yan
gene sang » gene bank
duong anh » dang anh, duong van, trong anh
yi human » i human, ii human, 2 human
lee sang » lee ann
cong seo » hong seo, cong shu, cong sun
yang yi » yang di, yang xi, yang jui

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 yi human ((gene sang) OR (lee sang)) minh ((cong seo) or (duong anh)) ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: yang yang yi human ((gene sang) OR (lee sang)) minh ((cong seo) OR (duong anh)) ;.
• The words AND, OR and NOT may confuse the search; try adding quotes: "yang yang yi human ((gene sang) OR (lee sang)) minh ((cong seo) or (duong anh)) ;".
• Adding a wildcard symbol may retrieve word variants: yang yang yi human ((gene sang) OR (lee sang)) minh ((cong seo) or (duong anh)) ;*.