Perhaps you should try some spelling variations:
"specialist periodical reports" » "specialized periodicals reports", "socialism periodicals reports", "specialist neurological reports", "specialist periodic report", "specialist periodical record", "specialist medical reports"
"specialist periodical returns" » "specialized periodicals returns", "socialism periodicals returns", "specialist neurological returns", "specialist periodical sets"
"special periodical reports" » "special periodic report", "special periodical record", "special medical reports", "special pedagogical reports", "serials periodicals reports", "specialized periodicals reports", "imperial periodical reports"
"specialist medical returns" » "special medical returns", "specific medical returns", "specialist seminar returns", "specialist medical records", "specialist medical reports", "specialist medical reasons"
"special period returns" » "imperial period returns"

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• If you are trying to use Boolean operators, they must be ALL CAPS: (((("specialist periodical reports") OR ("special periodical reports"))) OR ((((("specialist periodical returns") OR ("specialist medical returns"))) OR ("special period returns")))).
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• Adding a wildcard symbol may retrieve word variants: (((("specialist periodical reports") or ("special periodical reports"))) or ((((("specialist periodical returns") OR ("specialist medical returns"))) or ("special period returns"))))*.