Perhaps you should try some spelling variations:
"literatura espana e islam." » "literatura espanola e islam.", "literatura mexicana e islam.", "literatura despana e islam.", "literatura enspana e islam.", "literatura delspana e islam.", "literatura espana en islam.", "literatura espana el islam.", "literatura espana e islas."
"literatura dde del islam." » "literatura de del islam.", "literatura desde del islam.", "literatura del del islam.", "literatura dde el islam.", "literatura darde del islam.", "literatura sede del islam.", "literatura ddde del islam.", "literatura ddy del islam.", "literatura dd_ del islam."
"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 dde del islam.") or ("literatura espana e islam."))) or ("literatura e de isaac."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("literatura dde del islam.") OR ("literatura espana e islam."))) OR ("literatura e de isaac.")).
• Removing quotes may allow a broader search: (((( literatura dde del islam. ) or ( literatura espana e islam. ))) or ( literatura e de isaac. )).
• Adding a wildcard symbol may retrieve word variants: (((("literatura dde del islam.") or ("literatura espana e islam."))) or ("literatura e de isaac."))*.