Perhaps you should try some spelling variations:
_ estimate » _ estimation, _ estimating
2f estate » 24 estate, 27 estate, _ estate
2c john » 20 john, 24 john, 26 john
22 john » 2 john, 12 john
25 john » 5 john, 15 john
21 john » 11 john
23 john » 3 john, 13 john
c john » 4 john, 3 john, 5 john

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: %22orlebar%((((((((((2c john) OR (22 john))) OR (25 john))) OR (c john))) OR (((21 john) OR (1 john))))) OR (23 john)) %((2f estate) OR (_ estimate))%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%22orlebar%((((((((((2c john) OR (22 john))) or (25 john))) or (c john))) or (((21 john) or (1 john))))) or (23 john)) %((2f estate) or (_ estimate))%22".
• Adding a wildcard symbol may retrieve word variants: %22orlebar%((((((((((2c john) OR (22 john))) or (25 john))) or (c john))) or (((21 john) or (1 john))))) or (23 john)) %((2f estate) or (_ estimate))%22*.