Perhaps you should try some spelling variations:
"memoria la 10 anos." » "memoria de 10 anos.", "memoria en 10 anos.", "memoria e 10 anos.", "memoria la 12 anos.", "memoria la 1 anos.", "memoria la 14 anos.", "memoria la 18 anos."
"memoria la 15 anos." » "memoria de 15 anos.", "memoria en 15 anos.", "memoria e 15 anos.", "memoria la 25 anos.", "memoria la 12 anos.", "memoria las 15 anos.", "memoria la 1 anos.", "memoria ca 15 anos.", "memoria la 10 anos.", "memoria la 11 anos."
"memoria a 15 anos." » "memoria al 15 anos.", "memoria e 15 anos.", "memoria _ 15 anos.", "memoria a 25 anos.", "memoria a 12 anos.", "memoria a 10 anos.", "memoria a 11 anos."

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: (("memoria la 10 anos.") or ((("memoria la 15 anos.") OR ("memoria a 15 anos."))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("memoria la 10 anos.") OR ((("memoria la 15 anos.") OR ("memoria a 15 anos.")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"memoria la 10 anos.\") or (((\"memoria la 15 anos.\") OR (\"memoria a 15 anos.\"))))".
• Removing quotes may allow a broader search: (( memoria la 10 anos. ) or ((( memoria la 15 anos. ) OR ( memoria a 15 anos. )))).
• Adding a wildcard symbol may retrieve word variants: (("memoria la 10 anos.") or ((("memoria la 15 anos.") OR ("memoria a 15 anos."))))*.