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 writings, occasional writer", "occasional letters, occasional writer", "occasional notess, occasional notes"
"occasions writtens, occasions written" » "occasion written, occasions written", "occasions fitted, occasions written", "occasionally written, 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 ("occasions writtens, occasions written")))).
• Removing quotes may allow a broader search: (( occasional papers, occasional prayers ) or ((( occasional writers, occasional writer ) or ( occasions writtens, occasions written )))).
• Adding a wildcard symbol may retrieve word variants: (("occasional papers, occasional prayers") or ((("occasional writers, occasional writer") or ("occasions writtens, occasions written"))))*.