Perhaps you should try some spelling variations:
german gender » german lander, germany under, german border
human gender » bhutan gender, human gene, human genome
yuan chang » yuan cheng, huang chang, han chang
yang yang » wang yang, wang yan
wie von » die von, wie don, sowie von
von see » von seo, von seu, von sex

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

• Performing a fuzzy search may retrieve terms with similar spellings: (wan or lang) ((yuan chang) or (yang yang)) ((human gender) OR (german gender)) 4.2 wie von see ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (wan OR lang) ((yuan chang) OR (yang yang)) ((human gender) OR (german gender)) 4.2 wie von see ;*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(wan or lang) ((yuan chang) or (yang yang)) ((human gender) OR (german gender)) 4.2 wie von see ;*".