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 y de isla." » "literatura y de isaac."

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

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