Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
hien hanh » dieu hanh
trinh cua » trinh luat, trinh quan, trinh luan
tinh cua » sinh cua, tinh chat, tranh cua
cong dan » cong san, cong tan, huong dan
toan cao » toan tap
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: hoc hien hanh - hanh ((trinh cua) OR (tinh cua)) nhung cong dan ((toan cao) OR (toan ban))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hien hanh - hanh ((trinh cua) or (tinh cua)) nhung cong dan ((toan cao) OR (toan ban))~".
• Adding a wildcard symbol may retrieve word variants: hoc hien hanh - hanh ((trinh cua) or (tinh cua)) nhung cong dan ((toan cao) OR (toan ban))*.