Perhaps you should try some spelling variations:
gender codes » gender class, gender index, gender order
gender cops » gender class
wang wang » wang liang, wang yan, wang yong
wang yang » wang yan, wang liang, wang yanling
call die » cavell die, call date, call me
die spur » der spur
yan 2 » yan _, yan 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 wang) or (wang yang)) yan 2 ((gender codes) OR (gender cops)) call die spur ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((wang wang) OR (wang yang)) yan 2 ((gender codes) OR (gender cops)) call die spur ;*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((wang wang) or (wang yang)) yan 2 ((gender codes) OR (gender cops)) call die spur ;*".