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

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 ( specific medical reports )).
• Adding a wildcard symbol may retrieve word variants: (( specialist periodical reports ) or ( specific medical reports ))*.