Perhaps you should try some spelling variations:
chiet tach » chieu sach
hoc chiet » hoc thiet, hoc nhiet, hoc hien
hanh mang » nhanh mang, hanh trang, nhanh lang
qua trong » quan trong, qua trinh, qua song
mang qua » mang cua, mang vua, nang quan
dan toan » van toan, manh toan, xuan toan
dan than » dan chan, ban than, van than

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 mang qua trong cong ((dan toan) or (dan than)) ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc chiet tach - hanh mang qua trong cong ((dan toan) OR (dan than)) ban*.