Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
kinh sach » sinh sach, dinh sach, chinh sach
tinh sach » tinh cach, tinh mach, sinh sach
trinh cua » tinh cua, trinh luat, trinh quan
cong cong » cong dong, trong cong, dung cong
cong tan » cong tac, cong san, cong thanh
tran cau » tran chau, ran cau, tra cau
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: hoc ((kinh sach) OR (tinh sach)) - hanh trinh cua cong cong tan ((tran cau) OR (toan cau))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((kinh sach) OR (tinh sach)) - hanh trinh cua cong cong tan ((tran cau) or (toan cau))~".
• Adding a wildcard symbol may retrieve word variants: hoc ((kinh sach) OR (tinh sach)) - hanh trinh cua cong cong tan ((tran cau) or (toan cau))*.