Perhaps you should try some spelling variations:
"literature latina el islam." » "literature latin el islam.", "literatura latina el islam.", "iteratura latina el islam.", "literature latina en islam."
"literatura en de isaac." » "literatura de de isaac.", "literatura espana de isaac.", "literatura den de isaac.", "literatura deln de isaac."
"literatura e una idea." » "literatura de una idea.", "literatura del una idea.", "literatura e la idea.", "literatura le una idea.", "literatura ue una idea."

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