Perhaps you should try some spelling variations:
thanh trung » thanh tung
hieu lang » chieu sang, hieu quang, nhieu tang
chau tinh » cuu tinh, ha tinh, cua tinh
trung cap » truong cao, trung tam
sinh toan » tinh toan, hinh toan, sinh ton
minh toan » tinh toan, manh toan, minh tuan
cap dung » ap dung, cao dung, chan 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 ((hieu lang) OR (chau tinh)) - thanh trung cap dung trong ((sinh toan) OR (minh toan)) cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((hieu lang) or (chau tinh)) - thanh trung cap dung trong ((sinh toan) OR (minh toan)) cau~".
• Adding a wildcard symbol may retrieve word variants: ho ((hieu lang) or (chau tinh)) - thanh trung cap dung trong ((sinh toan) OR (minh toan)) cau*.