Perhaps you should try some spelling variations:
"serie policiaca public." » "serie politica publica.", "serie politica publicas.", "serie politico publico."
"serie politicas public." » "serie politicas publicad.", "serie politica publica.", "serie politica publicas."
"sobre politicas publicas." » "sobre politicas publicadas.", "sobre politica publicaas.", "sobre politica publicasas.", "sobre politica publicas.", "sobre politicas publica.", "sobre politicas publico."

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