Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
hoc thiet » hoc thieu, hoc thuyet, hoc hien
thang cua » thong cua, hang cua, than cua
ho chiet » ho chieu, ho thiet, hoa thiet
tang cua » mang cua, hang cua, tang luan
cong van » cong vang, cong san, song van
van quan » van ban
quan ban » quang ban, qua ban, quan 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 (hoc thiet)) tach - hanh ((thang cua) OR (tang cua)) nhung cong van quan ban~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((ho chiet) OR (hoc thiet)) tach - hanh ((thang cua) or (tang cua)) nhung cong van quan ban~".
• Adding a wildcard symbol may retrieve word variants: ((ho chiet) OR (hoc thiet)) tach - hanh ((thang cua) or (tang cua)) nhung cong van quan ban*.