Perhaps you should try some spelling variations:
das symposium » das symposion, bacus symposium, texas symposium
acs symposium » bacus symposium, lakes symposium, games symposium
symposium iv » symposium isvc
sas » sans, sams

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: (( das symposium iv ) OR ( acs symposium sas )).
• Adding a wildcard symbol may retrieve word variants: (( das symposium iv ) or ( acs symposium sas ))*.