Perhaps you should try some spelling variations:
proceedings el » proceedings etc, proceedings 2, proceedings 1
proceedings ec » proceedings etc, proceedings 2, proceedings 1
proceedings ed » proceedings 2nd, proceedings 3rd, proceedings etc

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 el) OR (proceedings ec))) OR (proceedings ed)) report.
• Adding a wildcard symbol may retrieve word variants: ((((proceedings el) or (proceedings ec))) or (proceedings ed)) report*.