Perhaps you should try some spelling variations:
duong cuong » duong cong, duong vuong, duong truong
thien thanh » tien thanh, thi thanh, hien hanh
thieu xanh » chieu xanh, hieu manh, thien anh
tranh van » tran van, trinh van, thanh van
van duong » van dong, van dung, van phong
cuong dan » cuong danh, huong dan, cong dan
dan than » dan chan, ban than, van than
than cap » khan cap, thanh lap, thanh cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((thieu xanh) or (thien thanh)) - canh tranh van duong cuong dan than cap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu xanh) OR (thien thanh)) - canh tranh van duong cuong dan than cap.
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu xanh) or (thien thanh)) - canh tranh van duong cuong dan than cap*.