Perhaps you should try some spelling variations:
"literatura arabe del islam." » "literatura breve del islam.", "literatura de del islam.", "literatura al del islam.", "literatura arabes del islam.", "literatura arabe de islam.", "literatura arabe el islam."
"literatura den e isolda." » "literatura de e isolda.", "literatura en e isolda.", "literatura del e isolda.", "literatura den de isolda.", "literatura den e isela.", "literatura den e isla.", "literatura den el isolda.", "literatura din e isolda."
"literatura e el islam." » "literatura de el islam.", "literatura en el islam.", "literatura del el islam.", "literatura es el islam."

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• Performing a fuzzy search may retrieve terms with similar spellings: (("literatura arabe del islam.") or ((("literatura den e isolda.") or ("literatura e el islam."))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("literatura arabe del islam.") OR ((("literatura den e isolda.") OR ("literatura e el islam.")))).
• Removing quotes may allow a broader search: (( literatura arabe del islam. ) or ((( literatura den e isolda. ) or ( literatura e el islam. )))).
• Adding a wildcard symbol may retrieve word variants: (("literatura arabe del islam.") or ((("literatura den e isolda.") or ("literatura e el islam."))))*.