Perhaps you should try some spelling variations:
springer proceedings » strings proceedings, seminar proceedings, rings proceedings
surgery proceedings » summary proceedings, surveys proceedings, neurosurgery proceedings
china proceedings » criminal proceedings, data proceedings

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: ((((springer proceedings) OR (surgery proceedings))) OR (((china proceedings) OR (theory proceedings)))) in mathematics & statistics.
• Adding a wildcard symbol may retrieve word variants: ((((springer proceedings) or (surgery proceedings))) or (((china proceedings) or (theory proceedings)))) in mathematics & statistics*.