Perhaps you should try some spelling variations:
cong thanh » dong thanh, cong trinh, truong thanh
hanh trinh » canh tranh, hanh chinh
trinh cua » tinh cua, trinh luat, trinh quan
theo chu » theo chieu, cho chu, chao chu
chu sach » cau sach, thu sach, chieu sach
cong tan » cong tac, cong san, cong ty
ran cau » van cau, can cau, tran chau
ban cau » bang cau, ban can, van cau

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 chu sach - hanh trinh cua cong ((cong tan) OR (cong thanh)) ((ran cau) OR (ban cau))~.
• Adding a wildcard symbol may retrieve word variants: theo chu sach - hanh trinh cua cong ((cong tan) or (cong thanh)) ((ran cau) or (ban cau))*.