Perhaps you should try some spelling variations:
abacus symposium » bacus symposium, aaas symposium, spaces symposium
acs symposium » bacus symposium, lakes symposium, games symposium
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) OR (((acs symposium) OR (das symposium)))) series.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((abacus symposium) or (((acs symposium) OR (das symposium)))) series".
• Adding a wildcard symbol may retrieve word variants: ((abacus symposium) or (((acs symposium) OR (das symposium)))) series*.