Perhaps you should try some spelling variations:
sanctioning administrative » sancion administrativa, sustaining administrative, sanciones administrativas
zonas economicas » teorias economicas, socio economicas, areas economica
bases economicas » bases tecnologicas, crisis economicas, bases biologicas
areas economicas » areas economica, area economica, teorias economicas
zona economica » teoria economica

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: sanctioning administrative ((((zona economica) OR (zonas economicas))) OR (((bases economicas) OR (areas economicas)))) del (derecho OR derechos)~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "sanctioning administrative ((((zona economica) or (zonas economicas))) or (((bases economicas) OR (areas economicas)))) del (derecho or derechos)~".
• Adding a wildcard symbol may retrieve word variants: sanctioning administrative ((((zona economica) or (zonas economicas))) or (((bases economicas) OR (areas economicas)))) del (derecho or derechos)*.