Perhaps you should try some spelling variations:
chieu sang » chieu sach, chieu xanh, hieu lang
trung tuan » trung thanh, trung tam, tran tuan
truong cao » truong dai
doi chieu » doc hieu, doi chi, ho chieu
dung cong » dung trong
cong dan » cong san, cong tan, huong dan
toan ban » van ban

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: doi chieu sang - thanh ((trung tuan) OR (truong cao)) dung cong dan ((toan tap) OR (toan ban))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi chieu sang - thanh ((trung tuan) or (truong cao)) dung cong dan ((toan tap) OR (toan ban))~".
• Adding a wildcard symbol may retrieve word variants: doi chieu sang - thanh ((trung tuan) or (truong cao)) dung cong dan ((toan tap) OR (toan ban))*.