Perhaps you should try some spelling variations:
"serie policiaca publicas." » "serie politicas publicas.", "serie politicas publicad."
"clase politica publicas." » "clase politicas publicas.", "clase politica publicaciones.", "clase politicas publicass.", "class political publicas.", "chile politica publicas."
"sobre politica publica." » "sobre politicas publicas.", "sobre politicas publica."

Try widening your search to All Fields.

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (("serie policiaca publicas.") or ((("clase politica publicas.") or ("sobre politica publica."))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("serie policiaca publicas.") OR ((("clase politica publicas.") OR ("sobre politica publica.")))).
• Removing quotes may allow a broader search: (( serie policiaca publicas. ) or ((( clase politica publicas. ) or ( sobre politica publica. )))).
• Adding a wildcard symbol may retrieve word variants: (("serie policiaca publicas.") or ((("clase politica publicas.") or ("sobre politica publica."))))*.