Perhaps you should try some spelling variations:
periodicals reports » periodicals part, periodic report, periodical record
specialist specific » specialist species, specialty specific, species specific
periodical returns » periodical sets
special periodical » special pedagogical, serials periodicals, specialized periodicals
periodical reports » periodic report, periodical record, medical reports
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 (periodical returns)) ) OR ( special periodical reports ))) 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 (periodical returns)) ) or ( special periodical reports ))) or ((( specialist specific returns ) or ( specialist period returns ))))".
• Adding a wildcard symbol may retrieve word variants: (((( specialized ((periodicals reports) OR (periodical returns)) ) or ( special periodical reports ))) or ((( specialist specific returns ) or ( specialist period returns ))))*.