Perhaps you should try some spelling variations:
thanh trung » thanh tung
chieu sach » chinh sach, chiet tach, chieu xanh
chieu sang » chieu xanh, hieu lang, nhieu tang
cong quang » luong quang, thong quang, duong quang
trung cao » truong cao, trung cap, trung co
dang cong » dung cong
nang cap » nang cao, nang cham, nang phap
hang cau » hang dau, hang ca, nhung cau

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

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