Perhaps you should try some spelling variations:
chieu sang » chieu sach, chieu xanh, hieu lang
trung cua » truong cua, trung tuan, dung cua
trung cap » truong cao, trung tam
dang cong » dung cong
cong dan » cong san, cong tan, huong dan
dan toan » van toan, dan than, manh toan
toan ban » van ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((dieu hanh) or (chieu sang)) - thanh ((trung cua) OR (trung cap)) dang cong dan toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((dieu hanh) OR (chieu sang)) - thanh ((trung cua) OR (trung cap)) dang cong dan toan ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((dieu hanh) or (chieu sang)) - thanh ((trung cua) OR (trung cap)) dang cong dan toan ban".
• Adding a wildcard symbol may retrieve word variants: hoc ((dieu hanh) or (chieu sang)) - thanh ((trung cua) OR (trung cap)) dang cong dan toan ban*.