Perhaps you should try some spelling variations:
2c prescriptions » tcm prescriptions, _ prescriptions, 2 prescription
dnf formulae » dnf formulas, cdnf formulas, cnf formulas
2f formulae » 2 formulae, 2.8 formulae, 2.9 formulae
20 formulae » 10 formulae, 2 formulae, 20 formula
25 receipts » 5 receipts, _ receipts, c 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 (dnf formulae))) OR (20 formulae))%25 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 (dnf formulae))) or (20 formulae))%25 receipts%2c prescriptions %2f early works to 1800%22".
• Adding a wildcard symbol may retrieve word variants: %22medicine %((((2f formulae) OR (dnf formulae))) or (20 formulae))%25 receipts%2c prescriptions %2f early works to 1800%22*.