Perhaps you should try some spelling variations:
"specialist periodical reports" » "specialized periodicals reports", "socialism periodicals reports", "specialist neurological reports", "specialist periodical returns", "specialist periodical record", "specialist periodical works"
"specialist periodical sets" » "specialized periodicals sets", "socialism periodicals sets", "specialist neurological sets", "specialist periodical set"
"specialist medical reports" » "special medical reports", "specific medical reports", "specialist seminar reports", "specialist medical record", "specialist technical reports", "specialist clinical reports"
"specialist medical records" » "special medical records", "specific medical records", "specialist seminar records", "specialist medical record"

Try widening your search to All Fields.

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: (((("specialist periodical reports") OR ("specialist periodical sets"))) OR ((("specialist medical reports") OR ("specialist medical records")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"specialist periodical reports\") OR (\"specialist periodical sets\"))) or (((\"specialist medical reports\") or (\"specialist medical records\"))))".
• Removing quotes may allow a broader search: (((( specialist periodical reports ) OR ( specialist periodical sets ))) or ((( specialist medical reports ) or ( specialist medical records )))).
• Adding a wildcard symbol may retrieve word variants: (((("specialist periodical reports") OR ("specialist periodical sets"))) or ((("specialist medical reports") or ("specialist medical records"))))*.