Perhaps you should try some spelling variations:
dung cong » dung trong
ho chiet » ho chieu, hoc thiet, hoa thiet
ho thiet » hoc thiet, hoa thiet, so thiet
tung tin » trung tin, thuong tin, trung tinh
dung tin » dong tin, luong tin, dung tren
cong tac » cong ty
tac tao » tai tao, tac bao, tac dao
tao cao » bao cao, toan cao

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 - thanh ((tung tin) OR (dung tin)) dung cong tac tao cao~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((ho chiet) OR (ho thiet)) tach - thanh ((tung tin) or (dung tin)) dung cong tac tao cao~".
• Adding a wildcard symbol may retrieve word variants: ((ho chiet) OR (ho thiet)) tach - thanh ((tung tin) or (dung tin)) dung cong tac tao cao*.