Perhaps you should try some spelling variations:
phung cong » nhung cong, phong cong, nhung chong
theo chieu » ho chieu, theo chu, thi chieu
hanh mang » nhanh mang, hanh trang, nhanh lang
cua phung » cua phuong, cua nhung, cua chung
mang cua » manh cua, dung cua, ban cua
tac toan » tam toan, hach toan, tich toan
tap toan » tap doan, tap quan, bai 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 (theo tieu)) tinh - hanh mang cua phung cong ((tac toan) OR (tap toan)) cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((theo chieu) or (theo tieu)) tinh - hanh mang cua phung cong ((tac toan) OR (tap toan)) cau~".
• Adding a wildcard symbol may retrieve word variants: ((theo chieu) or (theo tieu)) tinh - hanh mang cua phung cong ((tac toan) OR (tap toan)) cau*.