MPG.eBooks - Search Results - (("doctoral" OR "doctor") or ("doctoratus" or "doctorate"))

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If you are trying to use Boolean operators, they must be ALL CAPS: (("doctoral" OR "doctor") OR ("doctoratus" OR "doctorate")).
The words AND, OR and NOT may confuse the search; try adding quotes: "((\"doctoral\" OR \"doctor\") or (\"doctoratus\" or \"doctorate\"))".
Removing quotes may allow a broader search: (( doctoral OR doctor ) or ( doctoratus or doctorate )).
Adding a wildcard symbol may retrieve word variants: (("doctoral" OR "doctor") or ("doctoratus" or "doctorate"))*.