Perhaps you should try some spelling variations:
"literatura arabi et islam." » "literatura arabe et islam.", "literature arab et islam.", "literatura para et islam.", "literatura carabi el islam.", "literatura arabe en islam.", "literatura arabi el islam.", "literatura arabi e islam.", "literatura arabi 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 arabi et islam.") or ((("literatura e en islam.") OR ("literatura del en islam."))))~.
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• Adding a wildcard symbol may retrieve word variants: (("literatura arabi et islam.") or ((("literatura e en islam.") OR ("literatura del en islam."))))*.