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
25 receipts » 5 receipts, _ receipts, c receipts
21 early » 2.1 early, 1 early, 11 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))%25 receipts%2c prescriptions %21 early works to 1800%22.
• Adding a wildcard symbol may retrieve word variants: %22medicine %((2f formulae) or (20 formulae))%25 receipts%2c prescriptions %21 early works to 1800%22*.