Perhaps you should try some spelling variations:
theo chieu » theo tieu, theo chu, thi chieu
anh thang » danh thang, manh thang, anh thong
va phuong » cac phuong
ho chieu » hoc thieu, doi chieu, mot chieu
cong tac » cong ty
tac toan » tap toan, tam toan, hach toan
toan cau » toan cao, toan ban, toan tap

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 - anh thang ((va phuong) OR (va thuong)) cong tac toan cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((theo chieu) OR (ho chieu)) xanh - anh thang ((va phuong) or (va thuong)) cong tac toan cau~".
• Adding a wildcard symbol may retrieve word variants: ((theo chieu) OR (ho chieu)) xanh - anh thang ((va phuong) or (va thuong)) cong tac toan cau*.