Perhaps you should try some spelling variations:
chiet tach » chieu sach
hanh trinh » canh tranh, hanh chinh
duong cong » luong cong, duong trong, trong cong
trinh cua » tinh cua, trinh luat, trinh quan
dung cong » dung trong
ho chiet » ho chieu, ho thiet, hoc thiet
than cau » toan cau, than cap, thanh chau
phan cau » phan dau, phan cac, phan tu

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 - hanh trinh cua ((duong cong) or (dung cong)) tan ((than cau) or (phan cau))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho chiet tach - hanh trinh cua ((duong cong) OR (dung cong)) tan ((than cau) OR (phan cau)).
• Adding a wildcard symbol may retrieve word variants: ho chiet tach - hanh trinh cua ((duong cong) or (dung cong)) tan ((than cau) or (phan cau))*.