Perhaps you should try some spelling variations:
"literature arab de islam." » "literatura arabe de islam.", "literature early de islam.", "literatura para de islam.", "literature arab del islam.", "literature arab de isla.", "literature arab e islam.", "literature arabe de islam.", "literature aras de islam.", "literature arabes de islam."
"literatura del de islam." » "literatura de de islam.", "literatura en de islam.", "literatura del del islam.", "literatura del de isla.", "literatura del e islam.", "literatura del dean islam."
"literatura e de islam." » "literatura de de islam.", "literatura en de islam.", "literatura e del islam.", "literatura e de isla.", "literatura e e islam.", "literatura y de islam.", "literatura _ de islam."

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