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

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 prayerss, occasional prayers") OR ("occasional papers, occasional prayers"))) OR ("occasional proverbs, occasional prayers"))) OR ("occasional writers, occasional writer")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((((\"occasional prayerss, occasional prayers\") OR (\"occasional papers, occasional prayers\"))) or (\"occasional proverbs, occasional prayers\"))) or (\"occasional writers, occasional writer\"))".
• Removing quotes may allow a broader search: (((((( occasional prayerss, occasional prayers ) OR ( occasional papers, occasional prayers ))) or ( occasional proverbs, occasional prayers ))) or ( occasional writers, occasional writer )).
• Adding a wildcard symbol may retrieve word variants: (((((("occasional prayerss, occasional prayers") OR ("occasional papers, occasional prayers"))) or ("occasional proverbs, occasional prayers"))) or ("occasional writers, occasional writer"))*.