Perhaps you should try some spelling variations:
"literature earl e islam." » "literature early e islam.", "literatura al e islam.", "literature a e islam.", "literature earl el islam.", "literature earl del islam.", "literature earl _ islam."
"literature arab e islas." » "literatura arabe e islas.", "literature early e islas.", "literatura para e islas.", "literature arab el islam.", "literature arabe e islas.", "literature arabes e islas.", "literature arabe de islas."
"literature arab _ islas." » "literatura arabe _ islas.", "literature early _ islas.", "literatura para _ islas."

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