Perhaps you should try some spelling variations:
"church and state byzantine _ history." » "church and study byzantine _ history.", "church and attack byzantine _ history.", "church and saints byzantine _ history."
"church and late byzantine pre history." » "church and late byzantium pre history.", "church and art byzantine pre history.", "church and saints byzantine pre history.", "church and late byzantine era history.", "church and late byzantine empire history.", "church and late byzantine law history.", "church and late byzantine trade history.", "church and late byzantine life history.", "church and late 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 late byzantine pre history."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("church and state byzantine _ history.") OR ("church and late byzantine pre history.")).
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• Adding a wildcard symbol may retrieve word variants: (("church and state byzantine _ history.") or ("church and late byzantine pre history."))*.