Perhaps you should try some spelling variations:
theo chieu » ho chieu, theo chu, thi chieu
nhung cong » dung cong, thong cong, hang cong
van manh » van minh, van anh, van thanh
van hanh » van thanh, ban hanh, van anh
cong tac » cong ty
tac phan » tac pham, tai phan, tac phat
phan cau » phan dau, phan cac, phan tu

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 (theo tieu)) xanh - ((van manh) OR (van hanh)) va nhung cong tac phan cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((theo chieu) OR (theo tieu)) xanh - ((van manh) or (van hanh)) va nhung cong tac phan cau~".
• Adding a wildcard symbol may retrieve word variants: ((theo chieu) OR (theo tieu)) xanh - ((van manh) or (van hanh)) va nhung cong tac phan cau*.