Perhaps you should try some spelling variations:
"occasional writers, occasional writer" » "occasional drivers, occasional writer", "occasional writings, occasional writer", "occasional letters, occasional writer", "occasional notess, occasional notes", "occasions writtens, occasions written"
"occasional poemss, occasional poems" » "occasional poem, occasional poems", "occasional forms, occasional poems", "occasional peers, occasional poems", "occasional notess, occasional notes", "occasional verses, occasional verse"
"occasional prayer, occasional prayers" » "occasional paper, occasional papers", "occasional preacher, occasional preachers", "occasional papers, occasional paperss"

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 prayer, occasional prayers"))) OR ("occasional writers, occasional writer")).
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• Adding a wildcard symbol may retrieve word variants: (((("occasional poemss, occasional poems") or ("occasional prayer, occasional prayers"))) or ("occasional writers, occasional writer"))*.