Perhaps you should try some spelling variations:
"occasional poemss, occasional poems" » "occasional forms, occasional poems", "occasional peers, occasional poems", "occasional pieces, occasional poems", "occasional paperss, occasional papers", "occasional formsss, occasional formss", "occasional papersss, occasional paperss"
"occasional poem, occasional verse" » "occasional paper, occasional verse", "occasional forms, occasional verse", "occasional papers, occasional verse"

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 poemss, occasional poems") OR ((("occasional poem, occasional verse") OR ("occasional notes, occasional verse")))).
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• Removing quotes may allow a broader search: (( occasional poemss, occasional poems ) or ((( occasional poem, occasional verse ) OR ( occasional notes, occasional verse )))).
• Adding a wildcard symbol may retrieve word variants: (("occasional poemss, occasional poems") or ((("occasional poem, occasional verse") OR ("occasional notes, occasional verse"))))*.