Perhaps you should try some spelling variations:
tuong quang » truong quang, thuong quang, luong quang
thanh tuong » thanh thuong, thanh tung, thanh huong
quang trung » truong trung
trung trong » truong trung, thuong trong, dung trong
trong hach » trong mach, trong cach, trong hanh
hieu lang » chieu sang, hieu quang, nhieu tang
hach toan » thanh toan, manh toan
toan ban » van ban

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: doi ((chinh sach) OR (hieu lang)) - thanh tuong quang trung trong hach toan ban~.
• Adding a wildcard symbol may retrieve word variants: doi ((chinh sach) or (hieu lang)) - thanh tuong quang trung trong hach toan ban*.