Perhaps you should try some spelling variations:
"occasional letters; occasional letter" » "occasional writer; occasional letter", "occasional prayers; occasional letter", "occasional papers; occasional letter", "occasional writers; occasional writer"
"occasional verses; occasional verse" » "occasional sermons; occasional verse"

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; occasional letter") OR ("occasional verses; occasional verse"))) OR ("occasional poems; occasional notes")).
• Removing quotes may allow a broader search: (((( occasional letters; occasional letter ) or ( occasional verses; occasional verse ))) or ( occasional poems; occasional notes )).
• Adding a wildcard symbol may retrieve word variants: (((("occasional letters; occasional letter") or ("occasional verses; occasional verse"))) or ("occasional poems; occasional notes"))*.