Perhaps you should try some spelling variations:
"literatura de de isaacm." » "literatura de de isaac.", "literatura de e isaac.", "literatura de fe isaacm.", "literatura de di isaacm."
"literatura de de islam." » "literatura de del islam.", "literatura de e islam.", "literatura de de ilam.", "literatura de de isaacm.", "literatura de fe islam.", "literatura de di islam."
"literatura _ de isla." » "literatura _ de isaac."

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