Perhaps you should try some spelling variations:
thanh dong » thanh duong, thanh cong, hanh dong
thieu xanh » chieu xanh, hieu manh, thien danh
thien anh » thien danh, tien anh, thien thanh
bang cong » dang cong, bang song, hang cong
dong cua » dung cua, cong cua, huong cua
cua bang » chua bang, cua ban, cua dang
tac toan » tap toan, hach toan, tich toan
tam toan » tap toan, tam than, pham toan

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