Perhaps you should try some spelling variations:
"literatura arabe e islam." » "literatura breve e islam.", "literatura e e islam.", "literatura al e islam.", "literatura arabes e islam.", "literatura arabe de islam.", "literatura arabe en islam.", "literatura arabe e islas.", "literatura arabe del islam."
"literatura arabe el islam." » "literatura breve el islam.", "literatura e el islam.", "literatura al el islam.", "literatura arabe en islam.", "literatura arabe et islam.", "literatura arabes del islam.", "literatura arabes el islam.", "literatura arabe del islam.", "literatura arabe enl islam."
"literatura de et isla." » "literatura de e isla.", "literatura de en isla.", "literatura de eta isla.", "literatura de el isla."

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