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

Try widening your search to All Fields.

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