Perhaps you should try some spelling variations:
"literatura arabe al islam." » "literatura breve al islam.", "literatura de al islam.", "literatura al al islam.", "literatura arabe el islam.", "literatura arabe y islam.", "literatura arabe de islam.", "literatura arabe del islam.", "literatura arabe e islam."
"literatura del den islam." » "literatura de den islam.", "literatura en den islam.", "literatura del del islam.", "literatura del de islam.", "literatura del el islam.", "literatura del eden islam.", "literatura del dean islam."
"literatura e e islas." » "literatura de e islas.", "literatura en e islas.", "literatura e el islam.", "literatura e de islas.", "literatura el e islas."

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• Performing a fuzzy search may retrieve terms with similar spellings: (((("literatura arabe al islam.") or ("literatura del den islam."))) or ("literatura e e islas."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("literatura arabe al islam.") OR ("literatura del den islam."))) OR ("literatura e e islas.")).
• Removing quotes may allow a broader search: (((( literatura arabe al islam. ) or ( literatura del den islam. ))) or ( literatura e e islas. )).
• Adding a wildcard symbol may retrieve word variants: (((("literatura arabe al islam.") or ("literatura del den islam."))) or ("literatura e e islas."))*.