Perhaps you should try some spelling variations:
yang jean » yang dean, young jean, yang fan
john song » john wong, john bonn, john ngosong
song minh » sang minh, song min, song ming
yang pan » yang fan, yang dean, yang yang
tong hui » wang hui
gong hui » tong shui, wang hui, gong si
di john » dr john, de john, bei john
cong » congo, long, hong

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: wang ((yang pan) OR (yang jean)) di john song minh ((((cong shu) OR (tong hui))) OR (gong hui)) ;~.
• Adding a wildcard symbol may retrieve word variants: wang ((yang pan) or (yang jean)) di john song minh ((((cong shu) or (tong hui))) or (gong hui)) ;*.