Perhaps you should try some spelling variations:
hieu xanh » chieu xanh, hieu manh, hieu nganh
hanh hang » thanh hang, hang hang, hanh han
cua trong » cua truong, cua trung, qua trong
doc hieu » toc thieu, hoc thieu, hoc hien
hang cua » mang cua, hang ca, huong cua
cong dan » cong tan, huong dan, cong dong
cong san » cong tac
toan tap » toan ban

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 hang 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 hang cua trong ((cong dan) OR (cong san)) toan tap".
• Adding a wildcard symbol may retrieve word variants: doc hieu xanh - hanh hang cua trong ((cong dan) OR (cong san)) toan tap*.