Perhaps you should try some spelling variations:
theo chieu » ho chieu, theo chu, thi chieu
phung cong » nhung cong, phong cong, nhung chong
mang cua » manh cua, dung cua, cong cua
cong tac » cong ty
tac toan » tap toan, tam toan, hach toan
toan cau » toan cao, toan ban, toan tap
ban cua » ban quan

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)) tinh - hanh ((mang cua) OR (ban cua)) phung cong tac toan cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((theo chieu) or (theo tieu)) tinh - hanh ((mang cua) OR (ban cua)) phung cong tac toan cau~".
• Adding a wildcard symbol may retrieve word variants: ((theo chieu) or (theo tieu)) tinh - hanh ((mang cua) OR (ban cua)) phung cong tac toan cau*.