%20thi%EF%BF%BD%EF%BF%BD%EF%BF%BDt%20k%EF%BF%BD%EF%BF%BD%EF%BF%BD%20thi%20c%EF%BF%BD%EF%BF%BDng%20nh%EF%BF%BD%EF%BF%BD%20tr%EF%BF%BD%EF%BF%BD%EF%BF%BDn%20g%EF%BF%BD%EF%BF%BDi%20b%EF%BF%BD%EF%BF%BDnh%20thu%EF%BF%BD%EF%BF%BD%EF%BF%BDn