Perhaps you should try some spelling variations:
"belle-isle, charles lucas auguste fouque / duc de / 1684-1761" » "belle-isle, charles lucae august fouque / duc de / 1684-1761", "belle-isle, charles louis auguste fouque / duc de / 1684-1761", "belle-isle, charles case auguste fouque / duc de / 1684-1761"
"belle-isle, charles lucas auguste fouquet / duc de / 1684-1761" » "belle-isle, charles lucae august fouquet / duc de / 1684-1761", "belle-isle, charles louis auguste fouquet / duc de / 1684-1761", "belle-isle, charles case auguste fouquet / duc de / 1684-1761", "belle-isle, charles lucas auguste bouquet / duc de / 1684-1761"

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• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"belle-isle, charles lucas auguste fouque / duc de / 1684-1761\") OR (\"belle-isle, charles lucas auguste fouquet / duc de / 1684-1761\"))".
• Removing quotes may allow a broader search: (( belle-isle, charles lucas auguste fouque / duc de / 1684-1761 ) OR ( belle-isle, charles lucas auguste fouquet / duc de / 1684-1761 )).
• Adding a wildcard symbol may retrieve word variants: (("belle-isle, charles lucas auguste fouque / duc de / 1684-1761") OR ("belle-isle, charles lucas auguste fouquet / duc de / 1684-1761"))*.