Perhaps you should try some spelling variations:
"serie policiaca publicas." » "serie politicas publicas.", "serie politicas publicad."
"serie politica publicas." » "serie politicas publicas.", "serie politica publicaciones.", "serie politicas publicass.", "elite 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 politica publicas.") OR ("serie policiaca publicas."))) OR ("sobre politica publica."))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"serie politica publicas.\") OR (\"serie policiaca publicas.\"))) or (\"sobre politica publica.\"))~".
• Removing quotes may allow a broader search: (((( serie politica publicas. ) OR ( serie policiaca publicas. ))) or ( sobre politica publica. ))~.
• Adding a wildcard symbol may retrieve word variants: (((("serie politica publicas.") OR ("serie policiaca publicas."))) or ("sobre politica publica."))*.