Perhaps you should try some spelling variations:
specialized periodicals » specialized medical, specialized protocols
specialist periodical » specialist neurological
socialism periodicals » alcoholism periodicals, society periodicals, socialism political
"specialist medical reports" » "special medical reports", "specific medical reports", "specialist seminar reports", "specialist medical records", "specialist medical record", "specialist clinical reports"

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) OR (specialized periodicals))) or (socialism periodicals)) reports") OR ("specialist medical reports")).
• Removing quotes may allow a broader search: (( ((((specialist periodical) OR (specialized periodicals))) or (socialism periodicals)) reports ) or ( specialist medical reports )).
• Adding a wildcard symbol may retrieve word variants: (("((((specialist periodical) OR (specialized periodicals))) or (socialism periodicals)) reports") or ("specialist medical reports"))*.