Perhaps you should try some spelling variations:
"occasional letters; occasional letter" » "occasional writer; occasional letter", "occasional papers; occasional letter", "occasional writers; occasional writer"
"occasional prayers; occasional letter" » "occasional poems; occasional letter", "occasional writer; occasional letter", "occasional prayers; occasional writer"
"occasional notess; occasional notes" » "occasional notices; occasional notes", "occasional poems; occasional notes", "occasion notes; occasional notes"
"occasional verses; occasional verse" » "occasional sermons; 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 notess; occasional notes"))) OR ("occasional verses; occasional verse"))) OR ("occasional prayers; occasional letter"))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((((\"occasional letters; occasional letter\") OR (\"occasional notess; occasional notes\"))) or (\"occasional verses; occasional verse\"))) or (\"occasional prayers; occasional letter\"))*".
• Removing quotes may allow a broader search: (((((( occasional letters; occasional letter ) OR ( occasional notess; occasional notes ))) or ( occasional verses; occasional verse ))) or ( occasional prayers; occasional letter ))*.