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
song minh » sang minh, song ming, gong min
jeong ghi » hong ghi, jeong mi
song min » song ming, gong min, jong min

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)) ((song min) OR (song minh)) jeong ghi ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "wang wang yang ((human gender) OR (german gender)) ((song min) or (song minh)) jeong ghi ;~".
• Adding a wildcard symbol may retrieve word variants: wang wang yang ((human gender) OR (german gender)) ((song min) or (song minh)) jeong ghi ;*.