Perhaps you should try some spelling variations:
tuman john » dugan john, tian john, turn john
rojas juan » roa juan
juan rene » juan meng, juan rana
john song » john wong, john bonn, john ngosong
wing tan » wing ian, liang tan, hong tan
dong bin » dong sin, dong di, dann bin
shin » skin, sein, thin

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((wing tan) or (dong bin)) rojas juan rene tuman john song shin ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((wing tan) OR (dong bin)) rojas juan rene tuman john song shin ;*.