Perhaps you should try some spelling variations:
"literature early _ islam." » "literature study _ islam.", "literature latin _ islam.", "literatura al _ islam."
"literature arab _ islam." » "literatura arabe _ islam.", "literatura para _ islam.", "literatura arte _ islam."
"literatura en en islam." » "literatura de en islam.", "literatura espana en islam.", "literatura en el islam.", "literatura en e islam.", "literatura en un 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: (((("literature arab _ islam.") OR ("literature early _ islam."))) OR ("literatura en en islam."))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"literature arab _ islam.\") OR (\"literature early _ islam.\"))) or (\"literatura en en islam.\"))~".
• Removing quotes may allow a broader search: (((( literature arab _ islam. ) OR ( literature early _ islam. ))) or ( literatura en en islam. ))~.
• Adding a wildcard symbol may retrieve word variants: (((("literature arab _ islam.") OR ("literature early _ islam."))) or ("literatura en en islam."))*.