Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
hoc thiet » hoc thieu, hoc thuyet, hoc hien
trang cua » tranh cua, tang cua, trung cua
tang luan » dung luan
cong danh » cuong danh, cong dan, cong thanh
ho thiet » hoa thiet, so thiet, hoc thieu
danh van » doanh van, dang van, dinh 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 thiet) OR (hoc thiet)) tach - hanh ((trang cua) OR (tang luan)) nhung cong danh van ban~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((ho thiet) OR (hoc thiet)) tach - hanh ((trang cua) or (tang luan)) nhung cong danh van ban~".
• Adding a wildcard symbol may retrieve word variants: ((ho thiet) OR (hoc thiet)) tach - hanh ((trang cua) or (tang luan)) nhung cong danh van ban*.