Perhaps you should try some spelling variations:
"serie lecturas de clacso." » "serie letras de clacso.", "semir lecturas de clacso.", "serra lecturas de clacso.", "serie letrass de clacso."
"serie lectura de clacso." » "semir lectura de clacso.", "serra lectura de clacso.", "serie letras de clacso."
"serie poetas la clase." » "seis poetas la clase.", "serie notas la clase.", "segre poetas la clase.", "serie poeta la clase.", "serie poetas una clase.", "serie poetas de clase."

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