Perhaps you should try some spelling variations:
"literatura arab_ del islam." » "literatura arabe del islam.", "literature arab del islam.", "literatura para del islam.", "literatura arabes del islam.", "literatura arabe de islam.", "literatura arabe el islam.", "literatura arab_ el islam."
"literatura del de isaac." » "literatura de de isaac.", "literatura en de isaac.", "literatura del dean isaac."
"literatura e de isla." » "literatura de de isla.", "literatura en de isla.", "literatura y de isla.", "literatura _ de isla."

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