Perhaps you should try some spelling variations:
chieu xanh » chieu sang, chieu tinh, hieu manh
chieu sach » chinh sach, chiet tach, chieu sang
cong cong » cong dong, trong cong, dung cong
anh dung » anh dong, anh huong, sach dung
cho cong » cao cong, cua cong, cac cong
cong tan » cong tac, cong san, cong thanh
than cao » thai cao, than cap, than sao
toan cao » toan ban, toan tap

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

• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((chieu xanh) OR (chieu sach)) - anh dung cho cong cong tan ((than cao) OR (toan cao))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((chieu xanh) OR (chieu sach)) - anh dung cho cong cong tan ((than cao) or (toan cao))~".
• Adding a wildcard symbol may retrieve word variants: theo ((chieu xanh) OR (chieu sach)) - anh dung cho cong cong tan ((than cao) or (toan cao))*.