Perhaps you should try some spelling variations:
"specialist periodical returns" » "specialized periodicals returns", "socialism periodicals returns", "specialist medical returns", "specialist period returns"
"Specialist periodical reports" » "Specialist periodical record", "Specialist medical reports", "Specialist periodical works"
"Specialist periodical sets" » "Specialist periodical set"

Try widening your search to All Fields.

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