Perhaps you should try some spelling variations:
"serie 31 de mal." » "serie de de mal.", "serie la de mal.", "serie el de mal.", "serie 31 de mala.", "serie 30 de mal.", "serie 21 de mal.", "serie 3y de mal.", "serie 3_ de mal.", "serie 3o de mal."
"serie 11 de may." » "serie 100 de may.", "serie de de may.", "serie la de may.", "serie a1 de may.", "serie e1 de may.", "serie g1 de may.", "serie 11 de mayo.", "serie 11 de maya.", "serie 11 de man.", "serie 1y de may.", "serie 1_ de may.", "serie 1o de may."
"serie 1 de may." » "serie a de may.", "serie e de may.", "serie g de may.", "serie 1 de mayo.", "serie 1 de maya.", "serie 1 de man.", "serie y de may.", "serie _ de may.", "serie o de may."

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 31 de mal.") or ((("serie 1 de may.") OR ("serie 11 de may."))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("serie 31 de mal.") OR ((("serie 1 de may.") OR ("serie 11 de may.")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"serie 31 de mal.\") or (((\"serie 1 de may.\") OR (\"serie 11 de may.\"))))".
• Removing quotes may allow a broader search: (( serie 31 de mal. ) or ((( serie 1 de may. ) OR ( serie 11 de may. )))).
• Adding a wildcard symbol may retrieve word variants: (("serie 31 de mal.") or ((("serie 1 de may.") OR ("serie 11 de may."))))*.