Perhaps you should try some spelling variations:
wang yuhan » wang luhang, wang yan, wang yidan
wang yang » wang yan, wang liang, wang yanling
song ming » song bing, jong min, song jin
song min » jong min, song jin, song shin
gong min » jong min, gong meng, gong si
wong sau » wong sam, wong siu, wong shiu
wang a » wang _, fang a, lang a
a when » 3 when, 4 when, 1 when

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) OR (wang yuhan)) wang a when ((song min) OR (((gong min) OR (song ming)))) wong sau ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((wang yang) or (wang yuhan)) wang a when ((song min) or (((gong min) OR (song ming)))) wong sau ;~".
• Adding a wildcard symbol may retrieve word variants: ((wang yang) or (wang yuhan)) wang a when ((song min) or (((gong min) OR (song ming)))) wong sau ;*.