Perhaps you should try some spelling variations:
german gender » german lander, germany under, german border
human gene » human genome, human gender, human bone
yang yang » wang yang, wang yan
cong seo » hong seo, cong shu, cong sun
cong van » congo can, duong van, cong sun
yang yi » yang di, yang xi, yang jui
minh » mind, ming, mine

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 (german gender)) anh minh ((cong seo) OR (cong van)) ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "yang yang yi ((human gene) OR (german gender)) anh minh ((cong seo) OR (cong van)) ;".
• Adding a wildcard symbol may retrieve word variants: yang yang yi ((human gene) OR (german gender)) anh minh ((cong seo) OR (cong van)) ;*.