Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
hanh tranh » canh tranh, hanh trang, lanh tranh
hanh trinh » canh tranh, hanh chinh
hoc chieu » hoc thieu, ho chieu, hoc hien
song song » song hong, song dong, xuong song
song van » hoang van, trong van, duong van
van than » van thanh, van thang, van tuan
than cap » khan cap, thanh lap, thanh cac

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 tranh) or (hanh trinh)) qua song song van than cap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc chieu sach - ((hanh tranh) OR (hanh trinh)) qua song song van than cap.
• Adding a wildcard symbol may retrieve word variants: hoc chieu sach - ((hanh tranh) or (hanh trinh)) qua song song van than cap*.