Perhaps you should try some spelling variations:
_ estimate » _ estimation, _ estimating
2f estate » 24 estate, 27 estate, _ estate
22 john » 2 john, 23 john
14 john » 1 john, 11 john, 15 john
12 john » 2 john, 11 john
16 john » 1 john, 10 john, 6 john
c john » 1 john, 3 john, 5 john
4 john » 1 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%((c john) OR (((((22 john) OR (((14 john) OR (4 john))))) OR (((12 john) OR (16 john)))))) %((2f estate) OR (_ estimate))%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%22orlebar%((c john) or (((((22 john) or (((14 john) or (4 john))))) or (((12 john) OR (16 john)))))) %((2f estate) or (_ estimate))%22".
• Adding a wildcard symbol may retrieve word variants: %22orlebar%((c john) or (((((22 john) or (((14 john) or (4 john))))) or (((12 john) OR (16 john)))))) %((2f estate) or (_ estimate))%22*.