Perhaps you should try some spelling variations:
"literature arab et islam." » "literatura arabe et islam.", "literature early et islam.", "literatura arte et islam.", "literature arab el islam.", "literature arab e islam.", "literature arab del islam.", "literature arabe et islam.", "literature arabi et islam.", "literature arabe en islam."
"literatura para et islam." » "literatura arabe et islam.", "literatura al et islam.", "literatura a et islam.", "literatura para el islam.", "literatura para e islam.", "literatura para del islam.", "literatura para esta islam."
"literatura en un islam." » "literatura de un islam.", "literatura espana un islam.", "literatura en el islam.", "literatura en e islam.", "literatura en al islam."

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