Perhaps you should try some spelling variations:
"serie policiacas public." » "serie politicas publicas.", "serie politicas publicad.", "serie policiaca public.", "serie politicas public.", "serie politica public."
"series politica publicas." » "series politicas publicas.", "series politica publicaciones.", "series politicas publicass.", "series political publicas.", "serie politica publicas."
"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 policiacas public.") OR ("series politica publicas."))) OR ("sobre politica publica."))~.
• Removing quotes may allow a broader search: (((( serie policiacas public. ) or ( series politica publicas. ))) or ( sobre politica publica. ))~.
• Adding a wildcard symbol may retrieve word variants: (((("serie policiacas public.") or ("series politica publicas."))) or ("sobre politica publica."))*.