Perhaps you should try some spelling variations:
thanh trung » thanh tung
chieu sang » chieu sach, chieu xanh, hieu lang
doi chieu » doc hieu, doi chi, ho chieu
trung cap » truong cao, trung tam
hang nong » thang long, han tong
bang cong » dang cong, bang song, hang cong
tac toan » tap toan, tam toan, hach 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: doi chieu sang - thanh trung cap ((hang nong) or (bang cong)) tac toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chieu sang - thanh trung cap ((hang nong) OR (bang cong)) tac toan ban.
• Adding a wildcard symbol may retrieve word variants: doi chieu sang - thanh trung cap ((hang nong) or (bang cong)) tac toan ban*.