Perhaps you should try some spelling variations:
chieu sach » chiet tach, chieu sang, chieu xanh
hanh tranh » canh tranh, hanh trinh, hanh trang
cua tong » cua cong, cua nong, cua song
cua dong » chua dong, cua cong, cua dang
cong van » cong vang, cong san, song van
van tan » van tuan, van ban, van tai
tan tat » ban tat, toan tap, toan tai

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 (chinh sach)) - hanh tranh ((cua tong) or (cua dong)) cong van tan tat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu sach) OR (chinh sach)) - hanh tranh ((cua tong) OR (cua dong)) cong van tan tat.
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu sach) or (chinh sach)) - hanh tranh ((cua tong) or (cua dong)) cong van tan tat*.