Perhaps you should try some spelling variations:
"literatura de al islam." » "literatura de el islam.", "literatura de del islam.", "literatura de e islam.", "literatura de lal islam.", "literatura de _l islam."
"literatura de fe islam." » "literatura de e islam.", "literatura de de islam.", "literatura de del islam."
"literatura de a islam." » "literatura de e islam.", "literatura de _ islam.", "literatura de a islas.", "literatura de la islam."

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

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