Perhaps you should try some spelling variations:
"serie lecturas de clacsos." » "serie letras de clacsos.", "serie lectura de clacsos.", "serie lecturas de clacso.", "serie lecturas de casos.", "serie lecturas de clases."
"serie actas la clase." » "serie letras la clase.", "serie fichas la clase.", "serie actis la clase.", "serie actos la clase.", "serie lacteas la clase."
"serie notas la clase." » "serie notas a clase.", "serie poetas la clase.", "serie notas mas clase."

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (((("serie notas la clase.") OR ("serie actas la clase."))) or ("serie lecturas de clacsos."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("serie notas la clase.") OR ("serie actas la clase."))) OR ("serie lecturas de clacsos."))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"serie notas la clase.\") OR (\"serie actas la clase.\"))) or (\"serie lecturas de clacsos.\"))*".
• Removing quotes may allow a broader search: (((( serie notas la clase. ) OR ( serie actas la clase. ))) or ( serie lecturas de clacsos. ))*.