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

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 medica.") or ("serie politicas mexicana."))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("sobre politica publica.") OR ((("serie politica medica.") OR ("serie politicas mexicana."))))*.
• Removing quotes may allow a broader search: (( sobre politica publica. ) or ((( serie politica medica. ) or ( serie politicas mexicana. ))))*.