Perhaps you should try some spelling variations:
changed john » changed our, changed post, changed rome
change john » chasse john, change japan, channon john
wang yao » wang yan, yang yao, gang yao
yao yang » yang yang
yang jia » yang jie, yang jin, yang jing
jia when » jia shen, java when, a when
wong siu » wong shiu, kong siu, wong sau

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "wang yao yang jia when ((change john) OR (changed john)) wong siu ;~".
• Adding a wildcard symbol may retrieve word variants: wang yao yang jia when ((change john) OR (changed john)) wong siu ;*.