Perhaps you should try some spelling variations:
thanh cuong » thanh chuong, thanh huong, thanh duong
chieu xanh » chieu sach, chieu tinh, hieu manh
chieu sang » chieu sach, hieu lang, nhieu tang
tang cong » tang cuong, trang cong, dang cong
cong dan » cong san, cong tan, huong dan
dan than » dan chan, ban than, van than
than cau » toan cau, phan cau, than cap
ha tang » phap tang, cao tang, kho tang

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc ((chieu xanh) OR (chieu sang)) - ((thanh cuong) or (thanh cong)) ha tang cong dan than cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((chieu xanh) OR (chieu sang)) - ((thanh cuong) OR (thanh cong)) ha tang cong dan than cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc ((chieu xanh) OR (chieu sang)) - ((thanh cuong) or (thanh cong)) ha tang cong dan than cau".
• Adding a wildcard symbol may retrieve word variants: doc ((chieu xanh) OR (chieu sang)) - ((thanh cuong) or (thanh cong)) ha tang cong dan than cau*.