Perhaps you should try some spelling variations:
"literatura arabes e isaac." » "literatura arabe e isaac.", "literatura arte e isaac.", "literature arab e isaac.", "literatura arabes de isaac.", "literatura arabes en isaac.", "literatura arabes _ isaac."
"literatura 5e del islam." » "literatura de del islam.", "literatura e del islam.", "literatura del del islam.", "literatura 5e el islam.", "literatura fe del islam."
"literatura en de islam." » "literatura de de islam.", "literatura espana de islam.", "literatura en de isla.", "literatura en e islam.", "literatura en de ilam."

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• Performing a fuzzy search may retrieve terms with similar spellings: (("literatura arabes e isaac.") or ((("literatura 5e del islam.") or ("literatura en de islam."))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("literatura arabes e isaac.") OR ((("literatura 5e del islam.") OR ("literatura en de islam.")))).
• Removing quotes may allow a broader search: (( literatura arabes e isaac. ) or ((( literatura 5e del islam. ) or ( literatura en de islam. )))).
• Adding a wildcard symbol may retrieve word variants: (("literatura arabes e isaac.") or ((("literatura 5e del islam.") or ("literatura en de islam."))))*.