Perhaps you should try some spelling variations:
"literatura arabes e isla." » "literatura arabe e isla.", "literatura arte e isla.", "literature arab e isla.", "literatura arabes e islas.", "literatura arabes e islam.", "literatura arabes e isela."
"literatura arabes de isla." » "literatura arabe de isla.", "literatura arte de isla.", "literature arab de isla.", "literatura arabes y isla.", "literatura arabes de islas.", "literatura arabes de islam.", "literatura arabes de isela."
"literatura e de isaac." » "literatura de de isaac.", "literatura en de isaac.", "literatura del de isaac.", "literatura y de isaac.", "literatura _ de isaac."

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• Performing a fuzzy search may retrieve terms with similar spellings: (("literatura e de isaac.") or ((("literatura arabes e isla.") OR ("literatura arabes de isla."))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("literatura e de isaac.") OR ((("literatura arabes e isla.") OR ("literatura arabes de isla.")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"literatura e de isaac.\") or (((\"literatura arabes e isla.\") OR (\"literatura arabes de isla.\"))))".
• Removing quotes may allow a broader search: (( literatura e de isaac. ) or ((( literatura arabes e isla. ) OR ( literatura arabes de isla. )))).
• Adding a wildcard symbol may retrieve word variants: (("literatura e de isaac.") or ((("literatura arabes e isla.") OR ("literatura arabes de isla."))))*.