Perhaps you should try some spelling variations:
chiet tach » chieu sach
hanh trinh » hanh chinh
nhung cong » dung cong, thong cong, hang cong
cua nhung » va nhung
thoai cac » thong cac, tho cac, hoa cac
ho chiet » ho chieu, ho thiet, hoc thiet
cong tan » cong tac, cong san, cong thanh
tai cac » tai cuc

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: ho chiet tach - ((hanh trinh) OR (canh tranh)) cua nhung cong tan ((thoai cac) OR (tai cac))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho chiet tach - ((hanh trinh) or (canh tranh)) cua nhung cong tan ((thoai cac) OR (tai cac))~".
• Adding a wildcard symbol may retrieve word variants: ho chiet tach - ((hanh trinh) or (canh tranh)) cua nhung cong tan ((thoai cac) OR (tai cac))*.