Perhaps you should try some spelling variations:
"literatura en del islam." » "literatura espana del islam.", "literatura deln del islam.", "literatura en el islam."
"literatura e de isaac." » "literatura del de isaac.", "literatura y de isaac.", "literatura _ de isaac.", "literatura o de isaac."
"literatura de de isaac." » "literatura de fe isaac.", "literatura de di isaac.", "literatura dy de isaac.", "literatura d_ de isaac.", "literatura do de isaac."

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: (((("literatura e de isaac.") or ("literatura de de isaac."))) or ("literatura en del islam."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("literatura e de isaac.") OR ("literatura de de isaac."))) OR ("literatura en del islam.")).
• Removing quotes may allow a broader search: (((( literatura e de isaac. ) or ( literatura de de isaac. ))) or ( literatura en del islam. )).
• Adding a wildcard symbol may retrieve word variants: (((("literatura e de isaac.") or ("literatura de de isaac."))) or ("literatura en del islam."))*.