Perhaps you should try some spelling variations:
theo chieu » theo tieu, theo chu, thi chieu
hanh dung » thanh dung, anh dung, hanh dong
danh toan » manh toan, anh toan, dang toan
ho chieu » hoc thieu, doi chieu, mot chieu
luan ban » luan van, luan san, luan han
ban song » bang song, bean song, ban cong
dan toan » van toan, dan than, manh toan

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

• If you are trying to use Boolean operators, they must be ALL CAPS: ((theo chieu) OR (ho chieu)) xanh - hanh dung luan ban song ((danh toan) OR (dan toan)) cao~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((theo chieu) or (ho chieu)) xanh - hanh dung luan ban song ((danh toan) OR (dan toan)) cao~".
• Adding a wildcard symbol may retrieve word variants: ((theo chieu) or (ho chieu)) xanh - hanh dung luan ban song ((danh toan) OR (dan toan)) cao*.