Perhaps you should try some spelling variations:
hieu xanh » chieu xanh, hieu manh, hieu nganh
doc hieu » toc thieu, hoc thieu, hoc hien
chinh ha » chinh nha, chinh ta, chinh va
cong dan » cong tan, huong dan, cong dong
cong san » cong tac
toan cau » toan cao, toan ban, toan tap
ha tong » han tong, ha dong, ha tang

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: doc hieu xanh - hanh chinh ha tong ((cong dan) OR (cong san)) toan cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc hieu xanh - hanh chinh ha tong ((cong dan) OR (cong san)) toan cau".
• Adding a wildcard symbol may retrieve word variants: doc hieu xanh - hanh chinh ha tong ((cong dan) OR (cong san)) toan cau*.