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

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 ((( specialist ((specific returns) OR (specific regions)) ) 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 ((( specialist ((specific returns) OR (specific regions)) ) or ( specialist period returns ))))".
• Adding a wildcard symbol may retrieve word variants: (((( specialized periodicals reports ) or ( special periodical reports ))) or ((( specialist ((specific returns) OR (specific regions)) ) or ( specialist period returns ))))*.