Perhaps you should try some spelling variations:
doing sin » dong sin, doing un, doing von
ying john » king john, young john, ying jin
john song » john wong, john bonn, john ngosong
song yue » wong yue, song yun, hong yu
ta chen » hua chen
yi chen » jui chen
sin ja » bin ja
a chen » _ chen, n chen, z chen

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: doing sin ja ((((ta chen) OR (a chen))) OR (yi chen)) ying john song yue ;~.
• Adding a wildcard symbol may retrieve word variants: doing sin ja ((((ta chen) or (a chen))) or (yi chen)) ying john song yue ;*.