Perhaps you should try some spelling variations:
"literature arab _ plan." » "literatura arabe _ plan.", "literature early _ plan.", "literatura para _ plan."
"literatura del del islam." » "literatura de del islam.", "literatura en del islam.", "literatura edel del islam.", "literatura del de islam.", "literatura del dem islam."
"literatura el el islam." » "literatura en el islam.", "literatura e el islam.", "literatura de el islam.", "literatura es el islam."

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

• Performing a fuzzy search may retrieve terms with similar spellings: (((("literatura el el islam.") OR ("literatura del del islam."))) OR ("literature arab _ plan."))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"literatura el el islam.\") OR (\"literatura del del islam.\"))) OR (\"literature arab _ plan.\"))".
• Removing quotes may allow a broader search: (((( literatura el el islam. ) OR ( literatura del del islam. ))) OR ( literature arab _ plan. )).
• Adding a wildcard symbol may retrieve word variants: (((("literatura el el islam.") OR ("literatura del del islam."))) OR ("literature arab _ plan."))*.