Perhaps you should try some spelling variations:
"literatura arabe e islam." » "literatura breve e islam.", "literatura de e islam.", "literatura e e islam.", "literatura arabes e islam.", "literatura arabe de islam.", "literatura arabe en islam.", "literatura arabe el islam.", "literatura arabe e islas.", "literatura arabe del islam."
"literatura arabe del OR arabe el islam." » "literatura arabes del OR arabe el islam.", "literatura arabe de OR arabe el islam.", "literatura amable del OR arabe el islam.", "literatura arabe del OR arabe en islam.", "literatura arabe del OR arabe et islam.", "literatura arabe del OR arabes del islam.", "literatura arabe del OR arabes el islam.", "literatura arabe del OR arabe del islam.", "literatura arabe del OR arabe enl islam."

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