Perhaps you should try some spelling variations:
occasional letter » occasional writer, occasional verse
2f number » 22 number, 23 number, 29 number
21 number » 1 number, 22 number, 11 number
2 number » a number

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: %((22((occasional letter) OR (occasional notes))) OR (((occasional letter) OR (occasional notes)))) %((2f number) OR (((21 number) OR (2 number)))) 1%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%((22((occasional letter) or (occasional notes))) or (((occasional letter) or (occasional notes)))) %((2f number) or (((21 number) OR (2 number)))) 1%22".
• Adding a wildcard symbol may retrieve word variants: %((22((occasional letter) or (occasional notes))) or (((occasional letter) or (occasional notes)))) %((2f number) or (((21 number) OR (2 number)))) 1%22*.