Perhaps you should try some spelling variations:
theo chieu » theo tieu, ho chieu, theo chu
thanh tung » thanh cong
van khang » van khanh, van thanh, van quang
so thiet » soc thiet, hoc thiet, hoa thiet
van hang » van hoang, van thang, ban hang
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: ((theo chieu) or (so thiet)) tach - thanh tung ((van hang) or (van khang)) cong tac toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((theo chieu) OR (so thiet)) tach - thanh tung ((van hang) OR (van khang)) cong tac toan cau.
• Adding a wildcard symbol may retrieve word variants: ((theo chieu) or (so thiet)) tach - thanh tung ((van hang) or (van khang)) cong tac toan cau*.