Perhaps you should try some spelling variations:
"literature arab et islam." » "literatura arabe et islam.", "literature early et islam.", "literatura para et islam.", "literature arab e islam.", "literature arab del islam.", "literature arab e islas.", "literature arabe et islam.", "literature arabi et islam.", "literature arabe en islam."
"literatura es el islam." » "literatura e el islam.", "literatura el el islam.", "literatura del el islam."
"literatura en en islam." » "literatura de en islam.", "literatura espana en islam.", "literatura en e islam.", "literatura en un islam.", "literatura en en ilam.", "literatura en el islam."

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• Performing a fuzzy search may retrieve terms with similar spellings: (("literature arab et islam.") or ((("literatura es el islam.") or ("literatura en en islam."))))~.
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• Adding a wildcard symbol may retrieve word variants: (("literature arab et islam.") or ((("literatura es el islam.") or ("literatura en en islam."))))*.