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

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