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 papers, occasional prayers" » "occasional paper, occasional prayers", "occasional verse, occasional prayers", "occasional notes, occasional prayers"
"occasional papers, occasional poems" » "occasional paper, occasional poems", "occasional verse, occasional poems", "occasional notes, occasional poems", "occasional papers, occasional notes", "occasional papers, occasional verse"

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