Perhaps you should try some spelling variations:
thieu xanh » hieu manh, thien anh, thien danh
chieu xanh » chieu sach, chieu sang, chieu tinh
dung cong » dung trong
manh toan » thanh toan, anh tuan, tinh toan
anh tang » anh bang, anh dang, anh nang
tang qua » tang quan, tang cua, tang quy
qua dung » quang dung, su dung, qua song
dan toan » van toan, dan than, xuan 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 (chieu xanh)) - anh tang qua dung cong ((dan toan) or (manh toan)) cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu xanh) OR (chieu xanh)) - anh tang qua dung cong ((dan toan) OR (manh toan)) cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thieu xanh) OR (chieu xanh)) - anh tang qua dung cong ((dan toan) or (manh toan)) cao".
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu xanh) OR (chieu xanh)) - anh tang qua dung cong ((dan toan) or (manh toan)) cao*.