Perhaps you should try some spelling variations:
hieu xanh » chieu xanh, hieu manh, hieu nganh
hanh hanh » hanh han, xanh hanh, nhanh thanh
doc hieu » toc thieu, hoc thieu, hoc hien
cong dan » cong tan, huong dan, cong dong
cong san » cong tac
toan tai » doanh tai, toan ban, toan cao
toan tap » toan ban
hanh va » hang va, hanh vi

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 hanh va nhung ((cong dan) or (cong san)) ((toan tai) or (toan tap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu xanh - hanh hanh va nhung ((cong dan) OR (cong san)) ((toan tai) OR (toan tap)).
• Adding a wildcard symbol may retrieve word variants: doc hieu xanh - hanh hanh va nhung ((cong dan) or (cong san)) ((toan tai) or (toan tap))*.