Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
hoc thiet » hoc thieu, hoc thuyet, hoc hien
trinh cua » trinh luat, trinh quan, trinh luan
ho thiet » hoa thiet, so thiet, hoc thieu
tinh cua » sinh cua, tinh chat, tranh cua
cong van » cong vang, cong san, song van
van toan » van tuan, van tan, van thanh
toan ban » van ban

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 ((trinh cua) OR (tinh cua)) nhung cong van toan ban~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((ho thiet) or (hoc thiet)) tach - hanh ((trinh cua) OR (tinh cua)) nhung cong van toan ban~".
• Adding a wildcard symbol may retrieve word variants: ((ho thiet) or (hoc thiet)) tach - hanh ((trinh cua) OR (tinh cua)) nhung cong van toan ban*.