Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
trinh xay » trinh ky
dung cong » dung trong
ho chiet » ho chieu, hoc thiet, hoa thiet
ho thiet » hoc thiet, hoa thiet, so thiet
van van » van ban, tan van, van vat
san van » tan van, luan van, tran van

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

• If you are trying to use Boolean operators, they must be ALL CAPS: ((ho chiet) OR (ho thiet)) tach - hanh trinh xay dung cong ((van van) OR (san van)) ban~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((ho chiet) or (ho thiet)) tach - hanh trinh xay dung cong ((van van) OR (san van)) ban~".
• Adding a wildcard symbol may retrieve word variants: ((ho chiet) or (ho thiet)) tach - hanh trinh xay dung cong ((van van) OR (san van)) ban*.