Perhaps you should try some spelling variations:
"libre{acute}ias." » "libro{acute}ias.", "libre{acute}dias."
"libre{acute}vias." » "libro{acute}vias.", "libre{acute}vdias.", "libre{acute}via.", "libre{acute}dias.", "libre{acute}vial."
"libres{acute}rios." » "libros{acute}rios.", "libres{acute}rio."
"libror{acute}dos." » "libros{acute}dos.", "libro{acute}dos.", "librar{acute}dos."

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: (("libre{acute}ias." or "libre{acute}vias.") or ("libror{acute}dos." or "libres{acute}rios."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("libre{acute}ias." OR "libre{acute}vias.") OR ("libror{acute}dos." OR "libres{acute}rios.")).
• Removing quotes may allow a broader search: (( libre{acute}ias. or libre{acute}vias. ) or ( libror{acute}dos. or libres{acute}rios. )).
• Adding a wildcard symbol may retrieve word variants: (("libre{acute}ias." or "libre{acute}vias.") or ("libror{acute}dos." or "libres{acute}rios."))*.