Perhaps you should try some spelling variations:
hieu xanh » chieu xanh, hieu manh, hieu nganh
doc hieu » toc thieu, hoc thieu, hoc hien
nhan cua » nhat cua, nhan luc, nhan su
cong dan » cong tan, huong dan, cong dong
cong san » cong tac
toan tap » toan ban
han cua » hang cua, than cua, hanh cua

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