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
dang cong » dung cong
trinh ve » trinh he, trinh va, trinh vi
dan than » dan chan, ban than, van than
than tap » toan tap, han tap, phan tap

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 ve ((thanh cong) or (dang cong)) dan than tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc chieu sach - hanh trinh ve ((thanh cong) OR (dang cong)) dan than tap.
• Adding a wildcard symbol may retrieve word variants: hoc chieu sach - hanh trinh ve ((thanh cong) or (dang cong)) dan than tap*.