Perhaps you should try some spelling variations:
"serie politica americana." » "serie politica america.", "serie politicas america.", "serie politico america.", "serie politicas americana.", "serie policiaca americana.", "elite politica americana."
"serie politica mexicana." » "serie politico mexicano.", "serie politica mexico.", "serie politica medica.", "serie politicas mexicana.", "serie policiaca mexicana.", "elite politica mexicana."
"sobre politica publica." » "sobre politicas publicas.", "sobre politicas publica."

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

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