Perhaps you should try some spelling variations:
chiet tach » chieu sach
hanh trang » thanh trung, hanh trinh, minh trang
trong bai » trong ban, thong bai, trong hai
ho chiet » ho chieu, ho thiet, hoc thiet
vat dung » van dung, va dung, viet dung
bai ta » bai tap, bai ca, bai da
ta cau » tao cau, tra cau, va cau

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho chiet tach - ((hanh trang) or (canh tranh)) vat dung trong bai ta cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho chiet tach - ((hanh trang) OR (canh tranh)) vat dung trong bai ta cau.
• Adding a wildcard symbol may retrieve word variants: ho chiet tach - ((hanh trang) or (canh tranh)) vat dung trong bai ta cau*.