Perhaps you should try some spelling variations:
"church and state byzantine _ history." » "church and late byzantine _ history.", "church and study byzantine _ history.", "church and attack byzantine _ history."
"church and from byzantine pre history." » "church and roman byzantine pre history.", "church and art byzantine pre history.", "church and book byzantine pre history.", "church and from byzantine era history.", "church and from byzantine empire history.", "church and from byzantine law history.", "church and from byzantine trade history.", "church and from byzantine life history.", "church and from byzantine rome history."

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• Performing a fuzzy search may retrieve terms with similar spellings: (("church and state byzantine _ history.") or ("church and from byzantine pre history."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("church and state byzantine _ history.") OR ("church and from byzantine pre history.")).
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• Adding a wildcard symbol may retrieve word variants: (("church and state byzantine _ history.") or ("church and from byzantine pre history."))*.