Perhaps you should try some spelling variations:
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"a corporation biography sources" » "a reformation biography sources", "a federation biography sources", "a corporate geography sources", "a corporation bibliography resources", "_ corporation biography sources"
"a corporate biography series" » "a corporate geography series", "a corporate demography series", "a complete biography series", "a corporate biography sermons", "a corporate biography studies", "a corporate biography herve"

Try widening your search to All Fields.

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• If you are trying to use Boolean operators, they must be ALL CAPS: (((("rand corporation biography pericles") OR ("a corporation biography sources"))) OR ("a corporate biography series")).
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• Adding a wildcard symbol may retrieve word variants: (((("rand corporation biography pericles") or ("a corporation biography sources"))) or ("a corporate biography series"))*.