Perhaps you should try some spelling variations:
chiet tach » chieu sach
hanh trang » thanh trung, canh tranh, minh trang
hanh trinh » canh tranh, hanh chinh
hoc chiet » hoc thiet, hoc nhiet, hoc hien
cua nhung » va nhung
cong dan » cong san, huong dan, cong dong
cong tan » cong tac, cong san, cong thanh

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: hoc chiet tach - ((hanh trang) OR (hanh trinh)) cua nhung ((cong dan) or (cong tan)) van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc chiet tach - ((hanh trang) OR (hanh trinh)) cua nhung ((cong dan) OR (cong tan)) van ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc chiet tach - ((hanh trang) OR (hanh trinh)) cua nhung ((cong dan) or (cong tan)) van ban".
• Adding a wildcard symbol may retrieve word variants: hoc chiet tach - ((hanh trang) OR (hanh trinh)) cua nhung ((cong dan) or (cong tan)) van ban*.