Perhaps you should try some spelling variations:
chieu sach » chinh sach, chieu sang, chieu xanh
hanh tranh » canh tranh, hanh trinh, hanh trang
duong van » duong va, luong va, dang van
cua tong » cua cong, cua nong, cua song
cua dong » chua dong, cua cong, cua dang
van tan » van tuan, van ban, van tai
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) or (chiet tach)) - hanh tranh ((cua tong) or (cua dong)) duong van tan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu sach) OR (chiet tach)) - hanh tranh ((cua tong) OR (cua dong)) duong van tan tap.
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu sach) or (chiet tach)) - hanh tranh ((cua tong) or (cua dong)) duong van tan tap*.