Perhaps you should try some spelling variations:
"occasional letters; occasional letter" » "occasional writer; occasional letter", "occasional writers; occasional writer", "occasional verses; occasional verse"
"occasional prayers; occasional letter" » "occasional writer; occasional letter", "occasional prayers; occasional writer", "occasional prayers; occasional verse"
"occasional poems; occasional letter" » "occasional poems; occasional writer", "occasional poems; occasional verse", "occasional verse; occasional letter"
"occasional papers; occasional notes" » "occasional paper; occasional notes", "occasional verse; 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 notes"))) OR ((("occasional prayers; occasional letter") OR ("occasional poems; occasional letter")))).
• Removing quotes may allow a broader search: (((( occasional letters; occasional letter ) or ( occasional papers; occasional notes ))) or ((( occasional prayers; occasional letter ) or ( occasional poems; occasional letter )))).
• Adding a wildcard symbol may retrieve word variants: (((("occasional letters; occasional letter") or ("occasional papers; occasional notes"))) or ((("occasional prayers; occasional letter") or ("occasional poems; occasional letter"))))*.