Perhaps you should try some spelling variations:
prospeccion sociologica » aproximacion sociologica (Expand Search), perspectiva sociologica (Expand Search), proteccion radiologica (Expand Search)
de prospeccion » de proteccion (Expand Search), de proyeccion (Expand Search), la prospeccion (Expand Search)
euskadi ante » euskadi en (Expand Search)
ante de » antes de (Expand Search), agente de (Expand Search), antes del (Expand Search)