Perhaps you should try some spelling variations:
"literature arab e islam." » "literatura arabe e islam.", "literature early e islam.", "literatura para e islam.", "literature arab el islam.", "literature arab e islas.", "literature arabe e islam.", "literature arab _ islam.", "literature arabes e islam."
"literatura al de islam." » "literatura el de islam.", "literatura del de islam.", "literatura de de islam.", "literatura al de isla.", "literatura al de ilam.", "literatura al de islas.", "literatura al del islam.", "literatura al dr islam."
"literatura al del islam." » "literatura el del islam.", "literatura del del islam.", "literatura de del islam.", "literatura al el islam.", "literatura al den islam.", "literatura al debil islam.", "literatura al duelo islam.", "literatura al drl islam."

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