Perhaps you should try some spelling variations:
yang yang » wang yang, wang yan
sang minh » kang minah, anh minh, song ming
kang wong » kang young
wong shiu » wong siu, cong shu, song shin
cong van » congo can, duong van, cong sun
gan guan » yan guan, quan guan, fan guon
song min » song ming, gong min, jong min
dong di » dong sin

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: ((cong van) OR (dong di)) ((yang yang) OR (gan guan)) ((sang minh) OR (song min)) kang wong shiu ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((cong van) or (dong di)) ((yang yang) or (gan guan)) ((sang minh) OR (song min)) kang wong shiu ;~".
• Adding a wildcard symbol may retrieve word variants: ((cong van) or (dong di)) ((yang yang) or (gan guan)) ((sang minh) OR (song min)) kang wong shiu ;*.