Perhaps you should try some spelling variations:
duong van » cong van, duong anh
than your » than you, train your, thank you
than our » than one, than you
cong sun » cong shu, cong van, wing sun
way yan » way dan, way land
yan jiu » yang jie, yang jin, pang jiu
wang » wing, wan, lang

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 yanling ((than our) OR (than your)) way yan jiu ((cong sun) OR (duong van)) ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "wang yanling ((than our) OR (than your)) way yan jiu ((cong sun) or (duong van)) ;~".
• Adding a wildcard symbol may retrieve word variants: wang yanling ((than our) OR (than your)) way yan jiu ((cong sun) or (duong van)) ;*.