Perhaps you should try some spelling variations:
2c prescriptions » tcm prescriptions, _ prescriptions, 21 prescription
2 prescription » 12 prescription, 21 prescription, 22 prescription
2 formulae » 20 formulae, _ formulae, 2 formulas
20 formula » 20 formulae, 2 formula, 25 formula
c receipts » _ receipts, new receipts, all receipts
1720 early » 1727 early, 1820 early, 1770 early
2f early » 24 early, 20 early, 21 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 %((2 formulae) OR (20 formula))%c receipts%((2c prescriptions) OR (2 prescription)) %((2f early) OR (1720 early)) works to 1800%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%22medicine %((2 formulae) or (20 formula))%c receipts%((2c prescriptions) OR (2 prescription)) %((2f early) or (1720 early)) works to 1800%22".
• Adding a wildcard symbol may retrieve word variants: %22medicine %((2 formulae) or (20 formula))%c receipts%((2c prescriptions) OR (2 prescription)) %((2f early) or (1720 early)) works to 1800%22*.