Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu xanh
chieu sang » chieu xanh, hieu lang, nhieu tang
thanh dung » thanh duong, thanh tung, thanh hung
chau thong » chau phong, khau thong, chan thuong
thong cong » trong cong, tong cong, thong thong
dung chau » dung chat, dung cau, dung cho
cong dan » cong san, cong tan, huong dan
chay cao » cay cao, nha cao, cay co
chat cao » chat co, chat cho, chat bao

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 sach) OR (chieu sang)) - thanh dung chau thong cong dan ((chay cao) OR (chat cao))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((chieu sach) OR (chieu sang)) - thanh dung chau thong cong dan ((chay cao) or (chat cao))~".
• Adding a wildcard symbol may retrieve word variants: theo ((chieu sach) OR (chieu sang)) - thanh dung chau thong cong dan ((chay cao) or (chat cao))*.