Perhaps you should try some spelling variations:
"specialized periodicals reports" » "socialism periodicals reports", "specialized medical reports", "specialized protocols reports", "specialized periodicals part", "specialized periodic report", "specialized periodical record"
"specialist speciesical returns" » "specialist species returns", "specialist specific returns"
"specialist periodical returns" » "socialism periodicals returns", "specialist medical returns", "specialist neurological returns", "specialist periodical sets", "socialist periodical returns", "specialist speciesical returns", "specialist hearingical returns"
"special periodical reports" » "special pedagogical reports", "serials periodicals reports", "special medical reports", "special periodic report", "special periodical record", "imperial periodical reports"
"specialist period returns" » "socialist period returns", "specialist species returns", "specialist hearing returns"
"special period returns" » "imperial period returns"

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• If you are trying to use Boolean operators, they must be ALL CAPS: (((("specialized periodicals reports") OR ("special periodical reports"))) OR ((("specialist speciesical returns") OR ((((("specialist period returns") OR ("special period returns"))) OR ("specialist periodical returns")))))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"specialized periodicals reports\") or (\"special periodical reports\"))) or (((\"specialist speciesical returns\") or (((((\"specialist period returns\") OR (\"special period returns\"))) or (\"specialist periodical returns\"))))))".
• Removing quotes may allow a broader search: (((( specialized periodicals reports ) or ( special periodical reports ))) or ((( specialist speciesical returns ) or ((((( specialist period returns ) OR ( special period returns ))) or ( specialist periodical returns )))))).
• Adding a wildcard symbol may retrieve word variants: (((("specialized periodicals reports") or ("special periodical reports"))) or ((("specialist speciesical returns") or ((((("specialist period returns") OR ("special period returns"))) or ("specialist periodical returns"))))))*.