Perhaps you should try some spelling variations:
"occasional prayerss, occasional prayers" » "occasional prayer, occasional prayers", "occasional papers, occasional prayers", "occasional proverbs, occasional prayers", "occasional writers, occasional writer"
"occasional poemss, occasional poems" » "occasional poem, occasional poems", "occasional forms, occasional poems", "occasional pieces, occasional poems", "occasional notess, occasional notes", "occasional verses, occasional verse"
"occasional peers, occasional poems" » "occasional peers, occasional notes", "occasional peers, occasional verse", "occasional papers, occasional poems", "occasional users, occasional poems", "occasional letters, occasional poems"

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• If you are trying to use Boolean operators, they must be ALL CAPS: (("occasional prayerss, occasional prayers") OR ((("occasional poemss, occasional poems") OR ("occasional peers, occasional poems")))).
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• Removing quotes may allow a broader search: (( occasional prayerss, occasional prayers ) or ((( occasional poemss, occasional poems ) OR ( occasional peers, occasional poems )))).
• Adding a wildcard symbol may retrieve word variants: (("occasional prayerss, occasional prayers") or ((("occasional poemss, occasional poems") OR ("occasional peers, occasional poems"))))*.