Perhaps you should try some spelling variations:
specialized periodicals » socialism periodicals, specialized medical
specialized protocols » specified protocols, specialized tools, special protocols
periodicals reports » periodical returns, periodicals part, periodic report
protocols reports » protocols ports, protocols records, protocols reporting

You may be able to get more results by adjusting your search query.

• The words AND, OR and NOT may confuse the search; try adding quotes: "(( specialized periodicals reports ) OR ( specialized protocols reports ))".
• Adding a wildcard symbol may retrieve word variants: (( specialized periodicals reports ) OR ( specialized protocols reports ))*.