Perhaps you should try some spelling variations:
"christianity and inter regional -- islam." » "christianity and new regional -- islam."
"christianity and other religion -- islam." » "christianity and other religions -- islam.", "christianity and author religion -- islam.", "christianity and power religion -- islam."
"christianity and other regions -- islam." » "christianity and other religions -- islam.", "christianity and border regions -- islam."

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• Performing a fuzzy search may retrieve terms with similar spellings: (("christianity and inter regional -- islam.") or ((("christianity and other religion -- islam.") or ("christianity and other regions -- islam."))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("christianity and inter regional -- islam.") OR ((("christianity and other religion -- islam.") OR ("christianity and other regions -- islam.")))).
• Removing quotes may allow a broader search: (( christianity and inter regional -- islam. ) or ((( christianity and other religion -- islam. ) or ( christianity and other regions -- islam. )))).
• Adding a wildcard symbol may retrieve word variants: (("christianity and inter regional -- islam.") or ((("christianity and other religion -- islam.") or ("christianity and other regions -- islam."))))*.

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