Perhaps you should try some spelling variations:
chiet tach » chieu sach
hanh trang » thanh trung, canh tranh, hanh trinh
hoc chiet » hoc thiet, hoc nhiet, hoc hien
dung cong » dung trong
trang va » tran van, hang va
dan toan » van toan, manh toan, xuan toan
dan than » dan chan, ban than, van than
va dung » van dung, va duong, vat dung

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 trang va dung cong ((dan toan) or (dan than)) ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc chiet tach - hanh trang va dung cong ((dan toan) OR (dan than)) ban.
• Adding a wildcard symbol may retrieve word variants: hoc chiet tach - hanh trang va dung cong ((dan toan) or (dan than)) ban*.