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

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