Perhaps you should try some spelling variations:
yang yang » wang yang, wang yan
gene sang » gene bank
duong van » cong van, duong anh
yi human » i human, ii human, 2 human
lee sang » lee ann
cong seo » hong seo, cong sun, von seo
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 (cong shu))) or (duong van)) ;~.
• 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 (cong shu))) OR (duong van)) ;.
• 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 (cong shu))) or (duong van)) ;".
• Adding a wildcard symbol may retrieve word variants: yang yang yi human ((gene sang) OR (lee sang)) minh ((((cong seo) or (cong shu))) or (duong van)) ;*.