Perhaps you should try some spelling variations:
2c prescriptions » tcm prescriptions, _ prescriptions, 2 prescription
20 formulae » 10 formulae, 2 formulae, 20 formula
25 formula » 2 formula, 5 formula, _ 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 %((20 formulae) OR (25 formula))%c receipts%2c prescriptions %((2f early) OR (1720 early)) works to 1800%22.
• Adding a wildcard symbol may retrieve word variants: %22medicine %((20 formulae) or (25 formula))%c receipts%2c prescriptions %((2f early) or (1720 early)) works to 1800%22*.