Perhaps you should try some spelling variations:
specialized periodicals » socialism periodicals, specialized medical, specialized protocols
periodicals reports » periodicals part, periodic report, periodical record
specialist specific » specialist species, specialty specific, species specific
periodical reports » periodic report, periodical record, medical reports
periodical returns » periodical sets
specialist period » socialist period, special period, specialist species
specific returns » specific return, specific regions, specific results

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