Perhaps you should try some spelling variations:
chieu sang » chieu sach, chieu xanh, hieu lang
danh trung » dang trung, dinh trung, manh trung
doi chieu » doc hieu, doi chi, ho chieu
dap duong » dai duong, dam duong, doan duong
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: doi chieu sang - ((danh trung) or (canh tranh)) dap duong ((cong dan) OR (cong san)) toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chieu sang - ((danh trung) OR (canh tranh)) dap duong ((cong dan) OR (cong san)) toan tap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi chieu sang - ((danh trung) or (canh tranh)) dap duong ((cong dan) OR (cong san)) toan tap".
• Adding a wildcard symbol may retrieve word variants: doi chieu sang - ((danh trung) or (canh tranh)) dap duong ((cong dan) OR (cong san)) toan tap*.