Perhaps you should try some spelling variations:
"sobre politica publica." » "sobre politicas publicas.", "sobre politicas publica."
"limites criticos republica." » "limites juridicos republica.", "limites politicos republica.", "limites eticos republica."
"serie politica pablo." » "serie politicas pablo.", "serie policiaca pablo.", "elite politica pablo.", "serie politica para.", "serie colica pablo.", "serie politica al."

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: (((("sobre politica publica.") OR ("limites criticos republica."))) OR ("serie politica pablo."))~.
• Removing quotes may allow a broader search: (((( sobre politica publica. ) or ( limites criticos republica. ))) or ( serie politica pablo. ))~.
• Adding a wildcard symbol may retrieve word variants: (((("sobre politica publica.") or ("limites criticos republica."))) or ("serie politica pablo."))*.