Perhaps you should try some spelling variations:
occasional letter » occasional writer, occasional verse, occasional notes
23 number » 3 number, 22 number, 13 number
1 numbers » 2 numbers
2 number » a number
1 number » a number, 3 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: %occasional letter %((((23 number) OR (2 number))) OR (((1 number) OR (1 numbers)))) 1%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%occasional letter %((((23 number) or (2 number))) or (((1 number) OR (1 numbers)))) 1%22".
• Adding a wildcard symbol may retrieve word variants: %occasional letter %((((23 number) or (2 number))) or (((1 number) OR (1 numbers)))) 1%22*.