Perhaps you should try some spelling variations:
"debates politicos luis." » "debate politico luis.", "debates politicos las.", "debates politica luis.", "debates politicos los."
"elites politico luis." » "elite politico luis.", "elites politicas luis.", "elite politica luis.", "elites politico la."
"serie politicas publicas." » "serie policiaca publicas.", "serie politicas publica.", "serie politicas public.", "serie 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: (((("elites politico luis.") OR ("debates politicos luis."))) OR ("serie politicas publicas."))~.
• Removing quotes may allow a broader search: (((( elites politico luis. ) or ( debates politicos luis. ))) or ( serie politicas publicas. ))~.
• Adding a wildcard symbol may retrieve word variants: (((("elites politico luis.") or ("debates politicos luis."))) or ("serie politicas publicas."))*.