Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
hoc chiet » hoc thiet, hoc nhiet, hoc viet
tranh cua » manh cua
doanh cua » doanh luan
cong dan » cong san, cong tan, huong dan
dan than » dan chan, ban than, van than
than ban » thanh ban, toan ban, than man

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: ((hoc chiet) OR (hoc hien)) tach - canh ((tranh cua) OR (doanh cua)) nhung cong dan than ban~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc chiet) OR (hoc hien)) tach - canh ((tranh cua) or (doanh cua)) nhung cong dan than ban~".
• Adding a wildcard symbol may retrieve word variants: ((hoc chiet) OR (hoc hien)) tach - canh ((tranh cua) or (doanh cua)) nhung cong dan than ban*.