Perhaps you should try some spelling variations:
serie 11 » serie 31, serie 100, serie de
"serie 1 de mayo." » "serie 31 de mayo.", "serie a de mayo.", "serie e de mayo.", "serie 1 de mayao.", "serie 1 de malo.", "serie 1 de mano.", "serie y de mayo.", "serie _ de mayo.", "serie o de mayo."
"Serie 1 de may." » "Serie 1 de maya.", "Serie 1 de mal.", "Serie 1 de man.", "Serie y de may.", "Serie _ de may.", "Serie o de may."
"Serie 11 de may." » "Serie 11 de maya.", "Serie 11 de mal.", "Serie 11 de man.", "Serie 1y de may.", "Serie 1_ de may.", "Serie 1o de may."

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (("serie 1 de mayo.") or ((("Serie 1 de may.") OR ("Serie 11 de may."))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("serie 1 de mayo.") OR ((("Serie 1 de may.") OR ("Serie 11 de may."))))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"serie 1 de mayo.\") or (((\"Serie 1 de may.\") OR (\"Serie 11 de may.\"))))*".
• Removing quotes may allow a broader search: (( serie 1 de mayo. ) or ((( Serie 1 de may. ) OR ( Serie 11 de may. ))))*.