Perhaps you should try some spelling variations:
chieu sach » chiet tach, chieu sang, chieu xanh
hanh tranh » canh tranh, hanh trinh, hanh trang
cong vang » cong lang, cong quang, cong ngang
cua tong » cua cong, cua nong, cua song
cua dong » chua dong, cua cong, cua dang
vang ban » van ban, hang ban, nang ban
ban tat » ban tai, ban tay, ban dat

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 vang ban 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 vang ban tat.
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu sach) or (chinh sach)) - hanh tranh ((cua tong) or (cua dong)) cong vang ban tat*.