Perhaps you should try some spelling variations:
thanh trung » thanh tung
chieu xanh » chieu sach, chieu sang, chieu tinh
khong cong » thong cong, khong cang, chong cong
thien anh » thien danh, tien anh, thien thanh
hua khong » hoa khong, cua khong, hoac khong
cong san » cong tac
san van » tan van, luan van, tran van

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((chieu xanh) or (thien anh)) - ((canh tranh) or (thanh trung)) hua khong cong san van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu xanh) OR (thien anh)) - ((canh tranh) OR (thanh trung)) hua khong cong san van ban.
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu xanh) or (thien anh)) - ((canh tranh) or (thanh trung)) hua khong cong san van ban*.