Perhaps you should try some spelling variations:
"occasional notes; occasional letter" » "occasional notes; occasional verse"
"occasional writer; occasional letter" » "occasional writer; occasional verse", "occasions written; occasional letter"

Try widening your search to All Fields.

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• If you are trying to use Boolean operators, they must be ALL CAPS: (("occasional notes; occasional letter") OR ("occasional writer; occasional letter")).
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• Adding a wildcard symbol may retrieve word variants: (("occasional notes; occasional letter") or ("occasional writer; occasional letter"))*.