Perhaps you should try some spelling variations:
"serie 11 de mayo." » "serie 31 de mayo.", "serie 100 de mayo.", "serie de de mayo.", "serie 311 de mayo.", "serie a1 de mayo.", "serie e1 de mayo.", "serie 1y de mayo.", "serie 1_ de mayo.", "serie 1a de mayo."
serie o » serie a, serie e, serie g
"Serie 1 de mayo." » "Serie y de mayo.", "Serie _ de mayo.", "Serie a de mayo."
"Serie o de mayo." » "Serie y de mayo.", "Serie _ de mayo."

Try widening your search to All Fields.

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