Perhaps you should try some spelling variations:
thanh thang » nhanh thang, thanh thanh, thanh hang
theo chieu » theo tieu, theo chu, thi chieu
ho chieu » hoc thieu, doi chieu, mot chieu
cong tac » cong ty
tac toan » tap toan, tam toan, hach toan
toan cau » toan cao, toan ban, toan tap
va bang » va nang, va lang, va hang
va ban » van ban, va bai, va bao

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: ((ho chieu) OR (theo chieu)) tinh - thanh thang ((va bang) OR (va ban)) cong tac toan cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((ho chieu) or (theo chieu)) tinh - thanh thang ((va bang) OR (va ban)) cong tac toan cau~".
• Adding a wildcard symbol may retrieve word variants: ((ho chieu) or (theo chieu)) tinh - thanh thang ((va bang) OR (va ban)) cong tac toan cau*.