Perhaps you should try some spelling variations:
2c prescriptions » tcm prescriptions, _ prescriptions, 21 prescription
2 prescription » 12 prescription, 21 prescription, 22 prescription
2.8 formulae » 12.8 formulare, 18 formulae, 2 formulae
2.9 formulae » 2 formulae, 4.3 formulae, 4.4 formulae
20 formulae » 10 formulae, 2 formulae, 20 formula
2c receipts » c receipts, 25 receipts, 2.2 receipts
2f early » 20 early, 21 early, ef early

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 %((((2.8 formulae) OR (2.9 formulae))) OR (20 formulae))%2c receipts%((2c prescriptions) OR (2 prescription)) %2f early works to 1800%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%22medicine %((((2.8 formulae) OR (2.9 formulae))) or (20 formulae))%2c receipts%((2c prescriptions) or (2 prescription)) %2f early works to 1800%22".
• Adding a wildcard symbol may retrieve word variants: %22medicine %((((2.8 formulae) OR (2.9 formulae))) or (20 formulae))%2c receipts%((2c prescriptions) or (2 prescription)) %2f early works to 1800%22*.