Perhaps you should try some spelling variations:
hieu xanh » chieu xanh, hieu manh, hieu nganh
dung cong » dung trong
doc hieu » toc thieu, hoc thieu, hoc hien
chinh ca » chinh ta, chinh va, chinh tai
cong dan » cong san, cong tan, huong dan
toan cau » toan cao, toan tap, toan tai
ca dung » cao dung, cap dung, cu dung

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: doc hieu xanh - hanh chinh ca dung cong dan ((toan cau) OR (((toan ban) OR (van ban))))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc hieu xanh - hanh chinh ca dung cong dan ((toan cau) or (((toan ban) OR (van ban))))~".
• Adding a wildcard symbol may retrieve word variants: doc hieu xanh - hanh chinh ca dung cong dan ((toan cau) or (((toan ban) OR (van ban))))*.