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 » 10 formulae, 2 formulae, 20 formula
c receipts » _ receipts, new receipts, all receipts
2f early » 21 early, 22 early, f early
20 early » 10 early, 1820 early, 1720 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))%c receipts%2c prescriptions %((2f early) OR (20 early)) works to 1800%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%22medicine %((2f formulae) or (20 formulae))%c receipts%2c prescriptions %((2f early) OR (20 early)) works to 1800%22".
• Adding a wildcard symbol may retrieve word variants: %22medicine %((2f formulae) or (20 formulae))%c receipts%2c prescriptions %((2f early) OR (20 early)) works to 1800%22*.