Perhaps you should try some spelling variations:
thieu xanh » chieu xanh, hieu manh, thien danh
toan thanh » tran thanh, hoan thanh, toan thang
thien anh » thien danh, tien anh, thien thanh
manh toan » thanh toan, anh tuan, tinh toan
bang cong » dang cong, bang song, dung cong
hang cong » dang cong, hang nong, thanh cong
san toan » van toan, dan toan, xuan toan
toan cau » toan cao, toan ban, toan tap

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 anh)) - manh toan thanh ((bang cong) OR (hang cong)) san toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu xanh) OR (thien anh)) - manh toan thanh ((bang cong) OR (hang cong)) san toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thieu xanh) or (thien anh)) - manh toan thanh ((bang cong) OR (hang cong)) san toan cau".
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu xanh) or (thien anh)) - manh toan thanh ((bang cong) OR (hang cong)) san toan cau*.