Perhaps you should try some spelling variations:
"etica politica publicas." » "etica politica publica.", "etica politica publicaciones.", "publica politica publicas."
"sobre politica publico." » "sobre politica publica.", "sobre politico publico.", "sobre politicas publicad.", "sobre politicas publico."
"serie politicas publicas." » "serie policiaca publicas."

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: (((("sobre politica publico.") OR ("etica politica publicas."))) OR ("serie politicas publicas."))~.
• Removing quotes may allow a broader search: (((( sobre politica publico. ) or ( etica politica publicas. ))) or ( serie politicas publicas. ))~.
• Adding a wildcard symbol may retrieve word variants: (((("sobre politica publico.") or ("etica politica publicas."))) or ("serie politicas publicas."))*.