Perhaps you should try some spelling variations:
german gender » german lander, germany under, german border
human gender » bhutan gender, human gene, human genome
wang yang » wang yan, wang liang, wang yanling
congo can » congo call, cong van, congo a
anh ming » anh minh, wan ming
yang 2 » yang _, yang 8, yang 4

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

• Performing a fuzzy search may retrieve terms with similar spellings: wang yang 2 ((human gender) OR (german gender)) anh ming ((cong shu) or (congo can)) ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: wang yang 2 ((human gender) OR (german gender)) anh ming ((cong shu) OR (congo can)) ;.
• The words AND, OR and NOT may confuse the search; try adding quotes: "wang yang 2 ((human gender) OR (german gender)) anh ming ((cong shu) or (congo can)) ;".
• Adding a wildcard symbol may retrieve word variants: wang yang 2 ((human gender) OR (german gender)) anh ming ((cong shu) or (congo can)) ;*.