Perhaps you should try some spelling variations:
"sobre politicas publica." » "sobre politicas publicas.", "sobre politicas publicad.", "sobre politica publica.", "serie politicas publica."
"serie politica mexicana." » "serie politico mexicano.", "serie politica mexico.", "serie politica espana.", "serie politicas mexicana.", "serie policiaca mexicana.", "sobre politica mexicana."
"serie politica medica." » "serie politica america.", "serie politica mexico.", "serie practica medica.", "serie politicas medica.", "serie policiaca medica.", "sobre 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 politicas publica.") or ((("serie politica mexicana.") OR ("serie politica medica."))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("sobre politicas publica.") OR ((("serie politica mexicana.") OR ("serie politica medica."))))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"sobre politicas publica.\") or (((\"serie politica mexicana.\") OR (\"serie politica medica.\"))))*".
• Removing quotes may allow a broader search: (( sobre politicas publica. ) or ((( serie politica mexicana. ) OR ( serie politica medica. ))))*.