Perhaps you should try some spelling variations:
"literatura de et islam." » "literatura de el islam.", "literatura de e islam.", "literatura de del islam.", "literatura de eta islam.", "literatura de en islam."
"literatura de fe islam." » "literatura de e islam.", "literatura de del islam.", "literatura de el islam."
"literatura de de islam." » "literatura de del islam.", "literatura de de isla.", "literatura de e islam.", "literatura de di islam."

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 de et islam.") or ((("literatura de fe islam.") OR ("literatura de de islam."))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("literatura de et islam.") OR ((("literatura de fe islam.") OR ("literatura de de islam.")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"literatura de et islam.\") or (((\"literatura de fe islam.\") OR (\"literatura de de islam.\"))))".
• Removing quotes may allow a broader search: (( literatura de et islam. ) or ((( literatura de fe islam. ) OR ( literatura de de islam. )))).
• Adding a wildcard symbol may retrieve word variants: (("literatura de et islam.") or ((("literatura de fe islam.") OR ("literatura de de islam."))))*.