Perhaps you should try some spelling variations:
"occasional prayerss, occasional prayers" » "occasional prayer, occasional prayers", "occasional papers, occasional prayers", "occasional proverbs, occasional prayers", "occasional poemss, occasional poems"
"occasional writers, occasional writer" » "occasional writings, occasional writer", "occasional letters, occasional writer", "occasional proverbs, occasional writer", "occasional notess, occasional notes", "occasions writtens, occasions written"
"occasional drivers, occasional writer" » "occasional verse, occasional writer", "occasional papers, occasional writer", "occasional letters, occasional writer", "occasional drivers, occasional notes", "occasional drivers, occasions written"

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