Perhaps you should try some spelling variations:
thanh trung » thanh tung
chieu sang » chieu xanh, hieu lang, nhieu tang
chieu sach » chinh sach, chiet tach, chieu xanh
nhung cong » dung cong, thong cong, nhung don
quang toan » quang tuan, quang tran, quang doan
trung cua » truong cua, trung tuan, trung cap
hang cong » dang cong, hang nong, bang cong
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 ((chieu sang) OR (chieu sach)) - thanh trung cua ((nhung cong) or (hang cong)) quang toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu sang) OR (chieu sach)) - thanh trung cua ((nhung cong) OR (hang cong)) quang toan ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((chieu sang) OR (chieu sach)) - thanh trung cua ((nhung cong) or (hang cong)) quang toan ban".
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu sang) OR (chieu sach)) - thanh trung cua ((nhung cong) or (hang cong)) quang toan ban*.