Perhaps you should try some spelling variations:
"cuadernos a practicas." » "cuadernos de practicas.", "cuadernos del practicas.", "cuadernos _ practicas.", "cuadernos a practicar.", "cuadernos x practicas."
"cuadernos a practical." » "cuadernos de practical.", "cuadernos del practical.", "cuadernos _ practical.", "cuadernos la practica.", "cuadernos de practicas."
"cuadernos y practicas." » "cuadernos o practicas.", "cuadernos de practicas.", "acuadernos a practicas."

Try widening your search to All Fields.

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• Performing a fuzzy search may retrieve terms with similar spellings: (((("cuadernos a practicas.") OR ("cuadernos y practicas."))) or ("cuadernos a practical."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("cuadernos a practicas.") OR ("cuadernos y practicas."))) OR ("cuadernos a practical.")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"cuadernos a practicas.\") OR (\"cuadernos y practicas.\"))) or (\"cuadernos a practical.\"))".
• Removing quotes may allow a broader search: (((( cuadernos a practicas. ) OR ( cuadernos y practicas. ))) or ( cuadernos a practical. )).
• Adding a wildcard symbol may retrieve word variants: (((("cuadernos a practicas.") OR ("cuadernos y practicas."))) or ("cuadernos a practical."))*.