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