Perhaps you should try some spelling variations:
"medicine / formulae, receipts, descriptions / early works to 1800" » "medicine / formula, receipts, descriptions / early works to 1800", "medicine / formulas, receipts, descriptions / early works to 1800", "medicine / formulated, receipts, descriptions / early works to 1800"
"medicine / formulae, receipts, description / early works to 1800" » "medicine / formula, receipts, description / early works to 1800", "medicine / formulas, receipts, description / early works to 1800", "medicine / formulated, receipts, description / early works to 1800"

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• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"medicine / formulae, receipts, descriptions / early works to 1800\") OR (\"medicine / formulae, receipts, description / early works to 1800\"))".
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