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
dung chau » dung chat, dung cau, dung cho
thong dan » thong van, tuong dan, thong den
chan cao » chan cho, chay cao, toan cao
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 thong dan ((chan 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 thong dan ((chan cao) or (chat cao))~".
• Adding a wildcard symbol may retrieve word variants: theo ((chieu sach) OR (chieu sang)) - thanh dung chau thong thong dan ((chan cao) or (chat cao))*.