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

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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 poems") OR ("occasional notes, occasional notess")))).
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