Perhaps you should try some spelling variations:
doi chieu » doc hieu, doi chi, mot chieu
hanh hinh » hanh chinh, hanh tinh, hanh dinh
ho chieu » theo chieu, hoc thieu, mot chieu
cong dan » cong tan, huong dan, cong dong
cong san » cong tac
toan tap » toan ban
hinh va » chinh va, hanh va, tinh va
va dung » van dung, va duong, vat dung

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((ho chieu) or (doi chieu)) xanh - hanh hinh va dung ((cong dan) OR (cong san)) toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((ho chieu) OR (doi chieu)) xanh - hanh hinh va dung ((cong dan) OR (cong san)) toan tap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((ho chieu) or (doi chieu)) xanh - hanh hinh va dung ((cong dan) OR (cong san)) toan tap".
• Adding a wildcard symbol may retrieve word variants: ((ho chieu) or (doi chieu)) xanh - hanh hinh va dung ((cong dan) OR (cong san)) toan tap*.