Perhaps you should try some spelling variations:
"literatura arabe et islam." » "literatura breve et islam.", "literatura de et islam.", "literatura al et islam.", "literatura arabe en islam.", "literatura arabe el islam.", "literatura arabi et islam.", "literatura arabe del islam.", "literatura arabe e islas.", "literatura arabes et islam.", "literatura arabe det islam.", "literatura arabe ent islam."
"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 arabe del islam."
"literatura e en islam." » "literatura de en islam.", "literatura en en islam.", "literatura del en islam.", "literatura e el islam.", "literatura e un islam.", "literatura e en ilam.", "literatura fe en islam."

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