Perhaps you should try some spelling variations:
"occasional notess; occasional notes" » "occasional notices; occasional notes", "occasional poems; occasional notes", "occasional distress; occasional notes"
"occasion notes; occasional notes" » "occasion note; occasional notes", "occasion soups; occasional notes", "occasion both; occasional notes"

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• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"occasional notess; occasional notes\") OR (\"occasion notes; occasional notes\"))".
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