Perhaps you should try some spelling variations:
theo chieu » ho chieu, theo chu, thi chieu
tong cong » trong cong, cong cong, dung cong
anh hang » anh hoang, anh hung, anh bang
cong tac » cong ty
tac toan » tap toan, tam toan, hach toan
toan cau » toan cao, toan ban, toan tap
va tong » va thong, va tuong, va trong

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((theo chieu) OR (theo tieu)) tach - anh hang va tong cong tac toan cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((theo chieu) OR (theo tieu)) tach - anh hang va tong cong tac toan cau".
• Adding a wildcard symbol may retrieve word variants: ((theo chieu) OR (theo tieu)) tach - anh hang va tong cong tac toan cau*.