Perhaps you should try some spelling variations:
2c prescriptions » tcm prescriptions, _ prescriptions, 2 prescription
2f formulae » 2 formulae, dnf formulae, 2.8 formulae
20 formulae » 2 formulae, 20 formula, 20 formule
10 formulae » 10 formulas, 11 formulae, 17 formulae
c receipts » _ receipts, new receipts, all receipts
2f early » 20 early, 21 early, 22 early

Try widening your search to All Fields.

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: %22medicine %((2f formulae) OR (((20 formulae) OR (10 formulae))))%c receipts%2c prescriptions %2f early works to 1800%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%22medicine %((2f formulae) or (((20 formulae) OR (10 formulae))))%c receipts%2c prescriptions %2f early works to 1800%22".
• Adding a wildcard symbol may retrieve word variants: %22medicine %((2f formulae) or (((20 formulae) OR (10 formulae))))%c receipts%2c prescriptions %2f early works to 1800%22*.