Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
hanh trang » thanh trung, canh tranh, minh trang
hanh trinh » canh tranh, hanh chinh
dung cong » dung trong
cong san » cong tac
san toan » van toan, dan toan, manh toan
toan cau » toan cao, toan ban, toan tap
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: doi ((dieu hanh) or (chieu sach)) - ((hanh trang) or (hanh trinh)) va dung cong san toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi ((dieu hanh) OR (chieu sach)) - ((hanh trang) OR (hanh trinh)) va dung cong san toan cau.
• Adding a wildcard symbol may retrieve word variants: doi ((dieu hanh) or (chieu sach)) - ((hanh trang) or (hanh trinh)) va dung cong san toan cau*.