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

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 papers; occasional letter") OR ("occasional papers; occasional notes"))) OR ("occasional prayers; occasional letter")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"occasional papers; occasional letter\") OR (\"occasional papers; occasional notes\"))) or (\"occasional prayers; occasional letter\"))".
• Removing quotes may allow a broader search: (((( occasional papers; occasional letter ) OR ( occasional papers; occasional notes ))) or ( occasional prayers; occasional letter )).
• Adding a wildcard symbol may retrieve word variants: (((("occasional papers; occasional letter") OR ("occasional papers; occasional notes"))) or ("occasional prayers; occasional letter"))*.