Perhaps you should try some spelling variations:
german gender » german lander, germany under, german border
human gender » bhutan gender, human gene, human genome
yang yang » wang yang, wang yan
anh mind » anh minh, yang mind, a mind
cong sun » cong van, wing sun
yang yi » yang di, yang xi, yang jui

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

• If you are trying to use Boolean operators, they must be ALL CAPS: yang yang yi ((human gender) OR (german gender)) anh mind ((cong shu) OR (cong sun)) ;~.
• Adding a wildcard symbol may retrieve word variants: yang yang yi ((human gender) or (german gender)) anh mind ((cong shu) or (cong sun)) ;*.