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