Perhaps you should try some spelling variations:
"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 11 de mayo.", "serie y de mayo.", "serie _ de mayo."
"serie 1 de may." » "serie 31 de may.", "serie a de may.", "serie e de may.", "serie 1 de maya.", "serie 1 de mal.", "serie 1 de man.", "serie 11 de may.", "serie y de may.", "serie _ de may."
"serie 100 de may." » "serie 3100 de may.", "serie a00 de may.", "serie e00 de may.", "serie 100 de maya.", "serie 100 de mal.", "serie 100 de man.", "serie 10 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 100 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 100 de may."))))*.
• Removing quotes may allow a broader search: (( serie 1 de mayo. ) or ((( serie 1 de may. ) or ( serie 100 de may. ))))*.