Perhaps you should try some spelling variations:
yihan guan » yan guan
chen yang » chen rong
yang john » young john, king john, yang jin
john song » john wong, john bonn, john ngosong
yan yuan » yan guan, fang yuan, nan yan
hua chen » jui chen, yu chen, a chen
song sam » wong sam, kong sar, song pae

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

• Performing a fuzzy search may retrieve terms with similar spellings: lang ((yihan guan) or (yan yuan)) hua chen yang john song sam ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: lang ((yihan guan) OR (yan yuan)) hua chen yang john song sam ;.
• Adding a wildcard symbol may retrieve word variants: lang ((yihan guan) or (yan yuan)) hua chen yang john song sam ;*.