Perhaps you should try some spelling variations:
"serie carta de clases." » "serie arte de clases.", "serie carta de clase."
"serie actas de clases." » "serie letras de clases.", "serie fichas de clases.", "serie actas de clase.", "serie actas del clases.", "serie cartas de clases."
"serie art de bases." » "serie arte de bases.", "serie a de bases.", "serie al de bases.", "serie part de bases.", "serie l'art de bases.", "serie art deco bases."

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 actas de clases.") or ((("serie art de bases.") or ("serie carta de clases."))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("serie actas de clases.") OR ((("serie art de bases.") OR ("serie carta de clases.")))).
• Removing quotes may allow a broader search: (( serie actas de clases. ) or ((( serie art de bases. ) or ( serie carta de clases. )))).
• Adding a wildcard symbol may retrieve word variants: (("serie actas de clases.") or ((("serie art de bases.") or ("serie carta de clases."))))*.