Perhaps you should try some spelling variations:
socialist periodical » socialism periodicals, socialist period, socialist political
periodical returns » periodical sets
specialist period » socialist period, special period, specialist species

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 returns ) OR ( specialist period returns )).
• Adding a wildcard symbol may retrieve word variants: (( socialist periodical returns ) or ( specialist period returns ))*.