Perhaps you should try some spelling variations:
2c prescriptions » tcm prescriptions, _ prescriptions, 2 prescription
all receipts » sale receipts, also receipts, bills receipts
2f formulae » 2 formulae, dnf formulae, 2.8 formulae
20 formulae » 10 formulae, 2 formulae, 20 formula
2f early » 21 early, ef early, f early
20 early » 1820 early, 1720 early
10 early » 1800 early, 1820 early, 1770 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 %((2f formulae) OR (20 formulae))%all receipts%2c prescriptions %((2f early) OR (((20 early) OR (10 early)))) works to 1800%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%22medicine %((2f formulae) or (20 formulae))%all receipts%2c prescriptions %((2f early) or (((20 early) OR (10 early)))) works to 1800%22".
• Adding a wildcard symbol may retrieve word variants: %22medicine %((2f formulae) or (20 formulae))%all receipts%2c prescriptions %((2f early) or (((20 early) OR (10 early)))) works to 1800%22*.