Perhaps you should try some spelling variations:
2.8 formulae » 2.9 formulae, 12.8 formulare, 18 formulae
20 formulae » 10 formulae, 20 formula, 20 formule
25 receipts » _ receipts, c receipts, 25 recipes
2 formulae » _ formulae, 2 formulas, a formulae
5 receipts » _ receipts, c receipts, new receipts
2f early » 20 early, 22 early, f early
21 early » 2.1 early, 1 early, 11 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 (((20 formulae) OR (2 formulae))))%((25 receipts) OR (5 receipts))%_ prescriptions %((2f early) OR (21 early)) works to 1800%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%22medicine %((2.8 formulae) or (((20 formulae) or (2 formulae))))%((25 receipts) OR (5 receipts))%_ prescriptions %((2f early) or (21 early)) works to 1800%22".
• Adding a wildcard symbol may retrieve word variants: %22medicine %((2.8 formulae) or (((20 formulae) or (2 formulae))))%((25 receipts) OR (5 receipts))%_ prescriptions %((2f early) or (21 early)) works to 1800%22*.