Perhaps you should try some spelling variations:
hieu manh » chieu xanh, hieu nganh, dieu hanh
hanh tang » hanh trang, anh tang, hanh mang
doc hieu » toc thieu, hoc thieu, hoc hien
va thong » va thuong, va phuong, he thong
cong dan » cong tan, huong dan, cong dong
cong san » cong tac
toan ban » van ban
tang va » trang va, tang van, thang va

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 manh - hanh tang va thong ((cong dan) OR (cong san)) ((toan tap) or (toan ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu manh - hanh tang va thong ((cong dan) OR (cong san)) ((toan tap) OR (toan ban)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc hieu manh - hanh tang va thong ((cong dan) OR (cong san)) ((toan tap) or (toan ban))".
• Adding a wildcard symbol may retrieve word variants: doc hieu manh - hanh tang va thong ((cong dan) OR (cong san)) ((toan tap) or (toan ban))*.