Perhaps you should try some spelling variations:
doc chieu » doi chieu, toc thieu, hoc thieu
doc hieu » toc thieu, hoc thieu, hoc hien
trinh va » trinh van, trinh vat, trinh vi
trinh ve » trinh he, trinh vi, trinh viet
cong san » cong tac
san hang » san chang, ban hang, van hang
hang dau » hang va, hang tai

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((doc chieu) OR (doc hieu)) tinh - hanh ((trinh va) or (trinh ve)) trong cong san hang dau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doc chieu) OR (doc hieu)) tinh - hanh ((trinh va) OR (trinh ve)) trong cong san hang dau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((doc chieu) OR (doc hieu)) tinh - hanh ((trinh va) or (trinh ve)) trong cong san hang dau".
• Adding a wildcard symbol may retrieve word variants: ((doc chieu) OR (doc hieu)) tinh - hanh ((trinh va) or (trinh ve)) trong cong san hang dau*.