Perhaps you should try some spelling variations:
"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 letters, occasional writer", "occasional proverbs, occasional writer", "occasional notess, occasional notes", "occasions writtens, occasions written"
"occasional writings, occasional writer" » "occasional writings, occasional notes", "occasional writings, 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 papers, occasional prayers") OR ((("occasional writers, occasional writer") OR ("occasional writings, occasional writer")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"occasional papers, occasional prayers\") or (((\"occasional writers, occasional writer\") OR (\"occasional writings, occasional writer\"))))".
• Removing quotes may allow a broader search: (( occasional papers, occasional prayers ) or ((( occasional writers, occasional writer ) OR ( occasional writings, occasional writer )))).
• Adding a wildcard symbol may retrieve word variants: (("occasional papers, occasional prayers") or ((("occasional writers, occasional writer") OR ("occasional writings, occasional writer"))))*.