Perhaps you should try some spelling variations:
chiet tach » chieu sach
doi chiet » doi chieu, doi chi, doi viet
dung cong » dung trong
trang va » hang va
tran van » luan van
cong dan » cong san, cong tan, huong dan
dan than » dan chan, ban than, van than
than ban » thanh ban, toan ban, than man

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi chiet tach - hanh ((trang va) or (tran van)) dung cong dan than ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chiet tach - hanh ((trang va) OR (tran van)) dung cong dan than ban.
• Adding a wildcard symbol may retrieve word variants: doi chiet tach - hanh ((trang va) or (tran van)) dung cong dan than ban*.