Perhaps you should try some spelling variations:
"literatura araben en islam." » "literatura arabe en islam.", "literatura arte en islam.", "literature arab en islam.", "literatura arabes en islam.", "literatura agamben en islam.", "literatura araben el islam.", "literatura araben e islam.", "literatura araben en ilam."
"literatura e un islam." » "literatura en un islam.", "literatura del un islam.", "literatura e el islam.", "literatura e e islam.", "literatura e al islam.", "literatura es un islam.", "literatura fe un islam."
"literatura de un islam." » "literatura de el islam.", "literatura de e islam.", "literatura de al islam.", "literatura den un islam.", "literatura des un islam.", "literatura dfe un islam."

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• Performing a fuzzy search may retrieve terms with similar spellings: (("literatura araben en islam.") or ((("literatura e un islam.") OR ("literatura de un islam."))))~.
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• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"literatura araben en islam.\") or (((\"literatura e un islam.\") OR (\"literatura de un islam.\"))))".
• Removing quotes may allow a broader search: (( literatura araben en islam. ) or ((( literatura e un islam. ) OR ( literatura de un islam. )))).
• Adding a wildcard symbol may retrieve word variants: (("literatura araben en islam.") or ((("literatura e un islam.") OR ("literatura de un islam."))))*.