Perhaps you should try some spelling variations:
"specialized periodical returns" » "specialized periodicals returns", "specialized medical returns", "specialized biomedical returns", "specialized periodical sets"
"specialist speciesical returns" » "specialist species returns", "specialist specific returns"
"special periodical reports" » "special pedagogical reports", "serials periodicals reports", "specialized periodicals reports", "special periodic report", "special periodical record", "special medical reports"
"specialist period returns" » "socialist period returns", "special period returns", "specialist species returns"

You may be able to get more results by adjusting your search query.

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