Perhaps you should try some spelling variations:
doi chinh » do chinh, tai chinh, hoc chinh
hang cong » dang cong, hang nong, bang cong
trinh va » trinh van, trinh vat, trinh vi
trinh ve » trinh he, trinh vi, trinh viet
cong san » cong tac
chan ban » chat ban, chan nan, chan doan
can ban » van ban, toan 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 chinh sach - hanh ((trinh va) or (trinh ve)) hang cong san ((chan ban) OR (can ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chinh sach - hanh ((trinh va) OR (trinh ve)) hang cong san ((chan ban) OR (can ban)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi chinh sach - hanh ((trinh va) or (trinh ve)) hang cong san ((chan ban) OR (can ban))".
• Adding a wildcard symbol may retrieve word variants: doi chinh sach - hanh ((trinh va) or (trinh ve)) hang cong san ((chan ban) OR (can ban))*.