Perhaps you should try some spelling variations:
hieu lang » chieu sang, hieu quang, nhieu tang
cua thang » cua hang, cua thanh, cua thuong
xua thang » xuan thang, xuan thanh, xuan trang
nguoi dan » nguoi dao, nguoi san, nguong dan
toan cau » toan cao, toan tap, toan tai
toan ban » van ban
ho hieu » ho chieu, hoi hieu, nho hieu

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 hieu lang - hanh chinh ((cua thang) OR (xua thang)) nguoi dan ((toan cau) OR (toan ban))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho hieu lang - hanh chinh ((cua thang) or (xua thang)) nguoi dan ((toan cau) OR (toan ban))~".
• Adding a wildcard symbol may retrieve word variants: ho hieu lang - hanh chinh ((cua thang) or (xua thang)) nguoi dan ((toan cau) OR (toan ban))*.