Perhaps you should try some spelling variations:
abacus symposium » bacus symposium, acs symposium, aaas symposium
symposium series » symposium semi, symposium sas, symposium sss
das symposium » das symposion, bacus symposium, texas symposium

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: (( abacus symposium series ) OR ( das symposium series ))*.