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