Perhaps you should try some spelling variations:
chiet tach » chieu sach
hanh trung » thanh trung, hanh trang, manh trung
hoc chiet » hoc thiet, hoc nhiet, hoc hien
manh hung » anh huong
dung cong » dung trong
cong dan » cong san, cong tan, huong dan
va dung » van dung, va duong, vat dung
dan van » dang van, doan van, dao van

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 trung) or (manh hung)) va dung cong dan van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc chiet tach - ((hanh trung) OR (manh hung)) va dung cong dan van ban*.