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

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