Perhaps you should try some spelling variations:
thien hach » thien thanh, hien hanh
chiet tach » chieu sach
hanh trinh » canh tranh, hanh chinh
trinh cua » tinh cua, trinh luat, trinh quan
cua dang » cua cong, cua ban
cong tan » cong tac, cong thanh, cong ty
cong san » cong tac

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 ((thien hach) OR (chiet tach)) - hanh trinh cua dang ((cong tan) OR (cong san)) van ban~.
• Adding a wildcard symbol may retrieve word variants: hoc ((thien hach) or (chiet tach)) - hanh trinh cua dang ((cong tan) or (cong san)) van ban*.