Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
hanh tranh » canh tranh, hanh trinh, hanh trang
hoc chieu » hoc thieu, ho chieu, hoc hien
cua tong » cua cong, cua nong, cua song
cua dong » chua dong, cua cong, cua dang
cong tan » cong tac, cong san, cong thanh
song van » hoang van, trong van, duong van
tan tap » toan tap, han tap, tan tat

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 ((cua tong) OR (cua dong)) ((cong tan) or (song van)) tan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc chieu sach - hanh tranh ((cua tong) OR (cua dong)) ((cong tan) OR (song van)) tan tap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc chieu sach - hanh tranh ((cua tong) OR (cua dong)) ((cong tan) or (song van)) tan tap".
• Adding a wildcard symbol may retrieve word variants: hoc chieu sach - hanh tranh ((cua tong) OR (cua dong)) ((cong tan) or (song van)) tan tap*.