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

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 verses; occasional verse"))) OR ((("occasional prayers; occasional letter") OR ("occasional poems; occasional letter"))))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"occasional letters; occasional letter\") or (\"occasional verses; occasional verse\"))) or (((\"occasional prayers; occasional letter\") OR (\"occasional poems; occasional letter\"))))*".
• Removing quotes may allow a broader search: (((( occasional letters; occasional letter ) or ( occasional verses; occasional verse ))) or ((( occasional prayers; occasional letter ) OR ( occasional poems; occasional letter ))))*.