Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
hanh trinh » canh tranh, hanh chinh
hoc chieu » hoc thieu, ho chieu, hoc hien
cua nong » cua cong, cuu nong, cua song
cua dong » chua dong, cua cong, cua dang
cong van » cong vang, cong san, song van
quan tap » quan tai, quan tam, quan tay
quan lap » quan luan, quang lam, quan lang

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