Perhaps you should try some spelling variations:
hieu xanh » chieu xanh, hieu manh, hieu nganh
chung cua » chung cu, dung cua, thong cua
huong cua » dung cua
doc hieu » toc thieu, hoc thieu, hoc hien
cong dan » cong tan, huong dan, cong dong
cong san » cong tac
toan cao » toan ban, toan tap

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 - anh ((chung cua) OR (huong cua)) thong ((cong dan) or (cong san)) toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu xanh - anh ((chung cua) OR (huong cua)) thong ((cong dan) OR (cong san)) toan cao*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc hieu xanh - anh ((chung cua) OR (huong cua)) thong ((cong dan) or (cong san)) toan cao*".