Perhaps you should try some spelling variations:
"regel, georg vilhelm friedrich <1770-1831>" » "regel, georg michael friedrich <1770-1831>", "regel, georg eichen friedrich <1770-1831>", "regel, georg halm friedrich <1770-1831>", "regel, georg wilhelm friedrich <1770-1831>", "regel, georg helm friedrich <1770-1831>", "regel, berg wilhelm friedrich <1770-1831>"
"regel, george wilhelm friedrich <1770-1831>" » "regel, georg wilhelm friedrich <1770-1831>", "regel, gehrke wilhelm friedrich <1770-1831>", "regel, gerke wilhelm friedrich <1770-1831>"

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• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"regel, george wilhelm friedrich <1770-1831>\") OR (\"regel, georg vilhelm friedrich <1770-1831>\"))".
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• Adding a wildcard symbol may retrieve word variants: (("regel, george wilhelm friedrich <1770-1831>") OR ("regel, georg vilhelm friedrich <1770-1831>"))*.