Perhaps you should try some spelling variations:
cong thanh » dong thanh, cong trinh, cong tan
tranh vat » trinh vat, tranh va, tranh van
theo dat » theo dau, theo luat, tren dat
dat sach » mat sach, dat khach, nam sach
vat dang » van dang, vat dung, va dang
cong tac » cong ty
toan cau » toan cao, toan ban, toan tap

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: theo dat sach - canh tranh vat dang ((cong thanh) OR (cong tac)) toan cau~.
• Adding a wildcard symbol may retrieve word variants: theo dat sach - canh tranh vat dang ((cong thanh) or (cong tac)) toan cau*.