Perhaps you should try some spelling variations:
"literatura arabe e islam." » "literatura breve e islam.", "literatura de e islam.", "literatura al e islam.", "literatura arabes e islam.", "literatura arabe de islam.", "literatura arabe en islam.", "literatura arabe el islam.", "literatura arabe e islas."
"literatura es del islam." » "literatura en del islam.", "literatura el del islam.", "literatura del del islam.", "literatura des del islam.", "literatura ens del islam.", "literatura dels del islam.", "literatura es el islam."
"literatura e del islam." » "literatura de del islam.", "literatura en del islam.", "literatura del del islam.", "literatura e el islam.", "literatura 5e del islam.", "literatura y del islam."

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• Performing a fuzzy search may retrieve terms with similar spellings: (("literatura arabe e islam.") or ((("literatura es del islam.") OR ("literatura e del islam."))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("literatura arabe e islam.") OR ((("literatura es del islam.") OR ("literatura e del islam.")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"literatura arabe e islam.\") or (((\"literatura es del islam.\") OR (\"literatura e del islam.\"))))".
• Removing quotes may allow a broader search: (( literatura arabe e islam. ) or ((( literatura es del islam. ) OR ( literatura e del islam. )))).
• Adding a wildcard symbol may retrieve word variants: (("literatura arabe e islam.") or ((("literatura es del islam.") OR ("literatura e del islam."))))*.