Perhaps you should try some spelling variations:
human gender » bhutan gender, german gender, human genome
human gene » human genome, human bone, human genetic
yang yang » wang yang, wang yan
sang minh » kang minah, anh minh, song min
duong anh » dang anh, duong van, trong anh
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) OR (human gender)) 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) OR (human gender)) 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) OR (human gender)) sang minh ((cong seo) or (duong anh)) ;".
• Adding a wildcard symbol may retrieve word variants: yang yang yi ((human gene) OR (human gender)) sang minh ((cong seo) or (duong anh)) ;*.