Perhaps you should try some spelling variations:
chiet tach » chieu sach
doi chiet » doi chieu, doi chi, doi viet
trinh va » trinh van, trinh vat, trinh vi
trinh ve » trinh he, trinh vi, trinh viet
cong dan » cong san, cong tan, huong dan
cong tac » cong ty
toan ban » van ban

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 ((trinh va) OR (trinh ve)) nhung ((cong dan) or (cong tac)) toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chiet tach - hanh ((trinh va) OR (trinh ve)) nhung ((cong dan) OR (cong tac)) toan ban*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi chiet tach - hanh ((trinh va) OR (trinh ve)) nhung ((cong dan) or (cong tac)) toan ban*".