Perhaps you should try some spelling variations:
chiet tach » chieu sach
hanh tranh » canh tranh, hanh trang, lanh tranh
hanh trinh » canh tranh, hanh chinh
hoc chiet » hoc thiet, hoc nhiet, hoc hien
dung cong » dung trong
cong bang » cuong bang, dong bang, hong bang
cua dung » cua dang, cua dong, qua dung
chat cao » chat co, chat cho, chat cam
chat bao » chat ban, thuat bao, nhat ban

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: hoc chiet tach - ((hanh tranh) OR (hanh trinh)) cua dung cong bang ((chat cao) or (chat bao))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc chiet tach - ((hanh tranh) OR (hanh trinh)) cua dung cong bang ((chat cao) OR (chat bao))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc chiet tach - ((hanh tranh) OR (hanh trinh)) cua dung cong bang ((chat cao) or (chat bao))*".