Perhaps you should try some spelling variations:
chiet tach » chieu sach
hanh tinh » hanh trinh, nhanh tinh, thanh tinh
ho chiet » ho chieu, ho thiet, hoc thiet
cong tan » cong san, cong thanh, cong ty
cong tac » cong ty
toan cau » toan cao, toan tap, toan tai
toan ban » van ban
tinh va » tich va, trinh van, trinh vat

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