Perhaps you should try some spelling variations:
yan yuhan » yan yuan, wang yuhan, yan guan
yang john » young john, king john, yang jun
yuhan vu » tuan vu
vu irene » _ irene
yang jin » yang jie, yang jun, ying jin
wong sam » wong sau, wong lai, kong sar
wang » wing, wan, lang

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

• Performing a fuzzy search may retrieve terms with similar spellings: wang yan yuhan vu irene ((yang john) or (yang jin)) wong sam ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: wang yan yuhan vu irene ((yang john) OR (yang jin)) wong sam ;.
• Adding a wildcard symbol may retrieve word variants: wang yan yuhan vu irene ((yang john) or (yang jin)) wong sam ;*.