Perhaps you should try some spelling variations:
session using » sessions using, suppression using, expression using
rate session » rates session, late session, rats session
world event » world events
event rate » event rates, event create, event state
acm world » acmet world, raum world, wcom world
2008 acm » 2008 a, 2008 a2, 2008 a1

You may be able to get more results by adjusting your search query.

• Adding a wildcard symbol may retrieve word variants: 2008 acm world event rate session using*.