Perhaps you should try some spelling variations:
theo chieu » theo tieu, theo chu, thi chieu
hanh trinh » canh tranh, hanh chinh
duong cong » dung cong, duong trong, trong cong
luong cong » dung cong, trong cong, cong cong
trinh cua » tinh cua, trinh luat, trinh quan
ho chieu » hoc thieu, doi chieu, mot chieu
tac than » tac thanh, tam than, tac nhan
than cau » toan cau, phan cau, than cap

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 (ho chieu)) sach - hanh trinh cua ((duong cong) OR (luong cong)) tac than cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((theo chieu) OR (ho chieu)) sach - hanh trinh cua ((duong cong) OR (luong cong)) tac than cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((theo chieu) or (ho chieu)) sach - hanh trinh cua ((duong cong) OR (luong cong)) tac than cau".
• Adding a wildcard symbol may retrieve word variants: ((theo chieu) or (ho chieu)) sach - hanh trinh cua ((duong cong) OR (luong cong)) tac than cau*.