Perhaps you should try some spelling variations:
occasional letters » occasional notes, occasional writer, occasional prayers
occasional letter » occasional writer, occasional verse, occasional notes
23 number » 2 number, 3 number, 22 number
21 number » 2 number, 1 number, 22 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 letters) OR (occasional letter)) %((23 number) OR (21 number)) 1%22.
• Adding a wildcard symbol may retrieve word variants: %((occasional letters) or (occasional letter)) %((23 number) or (21 number)) 1%22*.