Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
hanh trinh » canh tranh, hanh chinh
hoc chieu » hoc thieu, ho chieu, hoc hien
quan dung » quang dung, quan duong, quan dong
dang toan » dan toan, dung toan, dang thanh
dang tran » dang thanh, quang tran, hoang tran
qua dung » quang dung, su dung, qua song

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc chieu sach - hanh trinh ((quan dung) or (qua dung)) trong ((dang toan) OR (dang tran)) cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc chieu sach - hanh trinh ((quan dung) OR (qua dung)) trong ((dang toan) OR (dang tran)) cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc chieu sach - hanh trinh ((quan dung) or (qua dung)) trong ((dang toan) OR (dang tran)) cao".
• Adding a wildcard symbol may retrieve word variants: hoc chieu sach - hanh trinh ((quan dung) or (qua dung)) trong ((dang toan) OR (dang tran)) cao*.