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
trung ap » trung cap, trung lap, trung tam
van toan » van tan, van thanh, manh toan
van tuan » van quan, van ban, anh tuan
ap dung » xay dung, van dung

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: ho ((chieu sach) OR (chieu sang)) - thanh trung ap dung trong ((van toan) OR (van tuan)) cao~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((chieu sach) OR (chieu sang)) - thanh trung ap dung trong ((van toan) or (van tuan)) cao~".
• Adding a wildcard symbol may retrieve word variants: ho ((chieu sach) OR (chieu sang)) - thanh trung ap dung trong ((van toan) or (van tuan)) cao*.