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

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