Perhaps you should try some spelling variations:
hien hanh » dieu hanh
trang cua » tang cua, trung cua, thang cua
tranh cua » doanh cua, manh cua
bang cong » dang cong, bang song, hang cong
cong san » cong tac
khan cap » khan ap, khoan cam, phan cac
than cap » thanh lap, thanh cac, than cua

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 ((trang cua) OR (tranh cua)) bang cong san ((khan cap) OR (than cap))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hien hanh - hanh ((trang cua) or (tranh cua)) bang cong san ((khan cap) OR (than cap))~".
• Adding a wildcard symbol may retrieve word variants: hoc hien hanh - hanh ((trang cua) or (tranh cua)) bang cong san ((khan cap) OR (than cap))*.