Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
hanh trinh » hanh chinh
chau tinh » cuu tinh, ha tinh, cua tinh
dung cong » dung trong
cong dan » cong san, cong tan, huong dan
dan than » dan chan, ban than, van than
than cau » toan cau, phan cau, than cap
va dung » van dung, va duong, vat dung

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((chau tinh) or (chieu sach)) - ((hanh trinh) OR (canh tranh)) va dung cong dan than cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chau tinh) OR (chieu sach)) - ((hanh trinh) OR (canh tranh)) va dung cong dan than cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((chau tinh) or (chieu sach)) - ((hanh trinh) OR (canh tranh)) va dung cong dan than cau".
• Adding a wildcard symbol may retrieve word variants: hoc ((chau tinh) or (chieu sach)) - ((hanh trinh) OR (canh tranh)) va dung cong dan than cau*.