Perhaps you should try some spelling variations:
socialist periodical » socialism periodicals, socialist period, socialist political
periodical reports » periodical returns, periodical record, medical reports
specialist period » socialist period, special period, specialist species
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: (( socialist periodical reports ) OR ( specialist period returns )).
• Adding a wildcard symbol may retrieve word variants: (( socialist periodical reports ) or ( specialist period returns ))*.