Perhaps you should try some spelling variations:
phuong cong » phuong dong, phong cong, phung cong
va phuong » va thuong, cac phuong
ho chieu » theo chieu, hoc thieu, doi chieu
anh tang » anh bang, anh dang, anh nang
cong tac » cong ty
tac toan » tap toan, tam toan, hach toan
toan cau » toan cao, toan ban, toan tap
tang va » trang va, tang van, thang va

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((theo tieu) or (ho chieu)) xanh - anh tang va phuong cong tac toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((theo tieu) OR (ho chieu)) xanh - anh tang va phuong cong tac toan cau.
• Adding a wildcard symbol may retrieve word variants: ((theo tieu) or (ho chieu)) xanh - anh tang va phuong cong tac toan cau*.