Perhaps you should try some spelling variations:
german gender » german lander, germany under, german border
human gender » bhutan gender, human gene, human genome
wang wang » wang liang, wang yan, wang yong
wang yang » wang yan, wang liang, wang yanling
jong minh » gong min, sang minh, song min
jeong ghi » hong ghi, jeong mi
jong min » gong min, song min, song ming

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: wang wang yang ((human gender) OR (german gender)) ((jong min) OR (jong minh)) jeong ghi ;~.
• Adding a wildcard symbol may retrieve word variants: wang wang yang ((human gender) or (german gender)) ((jong min) or (jong minh)) jeong ghi ;*.