Perhaps you should try some spelling variations:
chiet tach » chieu sach
hanh trinh » hanh chinh
nhung cong » dung cong, thong cong, hang cong
cua nhung » va nhung
ho chiet » ho chieu, ho thiet, hoc thiet
cong tac » cong ty
tac toan » tap toan, tam toan, hach toan
toan cau » toan cao, toan ban, toan tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho chiet tach - ((((canh tranh) or (sach tranh))) or (hanh trinh)) cua nhung cong tac toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho chiet tach - ((((canh tranh) OR (sach tranh))) OR (hanh trinh)) cua nhung cong tac toan cau.
• Adding a wildcard symbol may retrieve word variants: ho chiet tach - ((((canh tranh) or (sach tranh))) or (hanh trinh)) cua nhung cong tac toan cau*.