Perhaps you should try some spelling variations:
proceedings 2nd » proceedings 2000, proceedings 2001, proceedings 2003
proceedings etc » proceedings ec, proceedings 4th, proceedings 11th
proceedings 5th » proceedings 15th, proceedings 6th, proceedings 11th

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: ((proceedings 2nd) OR (((proceedings etc) OR (proceedings 5th)))) report.
• Adding a wildcard symbol may retrieve word variants: ((proceedings 2nd) or (((proceedings etc) or (proceedings 5th)))) report*.