Perhaps you should try some spelling variations:
"literatura latina el islam." » "literature latin el islam.", "literatura clasica el islam.", "literatura alemana el islam.", "literatura latina en islam."
"literatura en de isaac." » "literatura de de isaac.", "literatura espana de isaac."
"literatura le la idea." » "literatura ele la idea.", "literatura de la idea.", "literatura e la idea.", "literatura fe la idea.", "literatura se la idea.", "literatura le la ideas."

Try widening your search to All Fields.

You may be able to get more results by adjusting your search query.

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