Perhaps you should try some spelling variations:
gender class » gender biases, gender bias
money saudi » money study
class than » less than, class taiwan
than money » than one
yang yang » wang yang, wang yan
yang jie » yang jin, yang di, yang jui
yang fan » zhang fan, yang dean, yang jin

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: yang ((yang jie) OR (((yang fan) OR (yang yang)))) a gender class than money saudi ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "yang ((yang jie) or (((yang fan) OR (yang yang)))) a gender class than money saudi ;~".
• Adding a wildcard symbol may retrieve word variants: yang ((yang jie) or (((yang fan) OR (yang yang)))) a gender class than money saudi ;*.