Perhaps you should try some spelling variations:
china gender » china under, child gender, chiefs gender
guan china » tuan china, wuhan china, human china
wing yan » wang yan, wing ian, wing tan
yan guan » gan guan, yan yuan, yang guang
wong sau » wong sam, wong siu, wong shiu
yang yi » yang xi, yang jui
lai » laid

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: wing yan guan china gender ((yang yi) OR (yang di)) ((wong sau) OR (wong lai)) ;~.
• Adding a wildcard symbol may retrieve word variants: wing yan guan china gender ((yang yi) or (yang di)) ((wong sau) or (wong lai)) ;*.