Perhaps you should try some spelling variations:
"serie policiaca publica." » "serie politica publicas.", "serie politicas publicas.", "serie politicas publicad."
"delito politico publicad." » "delito politicas publicad.", "delito politica publicas.", "delito politico publico.", "delitos politicos publicad.", "mito politico publicad.", "etico politico publicad."
"sobre politica publica." » "sobre politicas publicas.", "sobre politicas publica."

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: (((("serie policiaca publica.") OR ("delito politico publicad."))) OR ("sobre politica publica."))~.
• Removing quotes may allow a broader search: (((( serie policiaca publica. ) or ( delito politico publicad. ))) or ( sobre politica publica. ))~.
• Adding a wildcard symbol may retrieve word variants: (((("serie policiaca publica.") or ("delito politico publicad."))) or ("sobre politica publica."))*.