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 e islam.", "literatura arabe el islam.", "literatura arabe del islam."
"literatura del en islam." » "literatura de en islam.", "literatura en en islam.", "literatura del el islam.", "literatura del e islam.", "literatura del un islam.", "literatura del eln islam.", "literatura del ent islam."
"literatura e en islam." » "literatura de en islam.", "literatura en en islam.", "literatura e el islam.", "literatura e e islam.", "literatura e un islam.", "literatura fe en islam."

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