Perhaps you should try some spelling variations:
german gender » german lander, germany under, german border
human gender » bhutan gender, human gene, human genome
wong shiu » wong siu, cong shu, song shin
yan yuan » yan guan, fang yuan, nan yan
yang jie » yang jin, yang di, yang xi
yang jui » yang judy, yang di, yang xi
wang » wan, lang

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 OR wing) yan yuan ((human gender) OR (german gender)) ((yang jie) OR (yang jui)) wong shiu ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(wang or wing) yan yuan ((human gender) OR (german gender)) ((yang jie) or (yang jui)) wong shiu ;~".
• Adding a wildcard symbol may retrieve word variants: (wang or wing) yan yuan ((human gender) OR (german gender)) ((yang jie) or (yang jui)) wong shiu ;*.