Perhaps you should try some spelling variations:
"administracao de infraestructuras ferroviarias." » "administracao de infraestructuras viarias." (Expand Search), "administracao de infraestructura ferroviarias." (Expand Search), "administracao da infraestructuras ferroviarias." (Expand Search), "administracion de infraestructuras ferroviarias." (Expand Search), "administracion del infraestructuras ferroviarias." (Expand Search)