Perhaps you should try some spelling variations:
"literature latin e islas." » "literature spain e islas.", "literature 19th e islas.", "literature 20th e islas.", "literature latin en islas.", "literature latina e islas.", "literature latin el islas.", "literature latin el islam."
"literatura vale una idea." » "literatura al una idea.", "literatura ele una idea.", "literatura galega una idea.", "literatura hace una idea.", "literatura vale la idea."
"literatura en de isaac." » "literatura de de isaac.", "literatura espana de isaac."

Try widening your search to All Fields.

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