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
cong bang » cuong bang, dong bang, hong bang
bang chat » ban chat, van chat, bang cac
chat cao » chat co, chat cho, chat bao

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 nhung) or (va nhung)) cong bang chat cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc chiet tach - ((hanh tranh) OR (hanh trinh)) ((cua nhung) OR (va nhung)) cong bang chat cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc chiet tach - ((hanh tranh) OR (hanh trinh)) ((cua nhung) or (va nhung)) cong bang chat cao".
• Adding a wildcard symbol may retrieve word variants: hoc chiet tach - ((hanh tranh) OR (hanh trinh)) ((cua nhung) or (va nhung)) cong bang chat cao*.