Perhaps you should try some spelling variations:
abacus symposium » bacus symposium, acs symposium, aaas symposium
symposium series » symposium sas, symposium sss, symposium ssbse
symposium semi » symposium sas, symposium sss, symposium sagt

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 (symposium spire)) ) OR ( abacus symposium semi )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( abacus ((symposium series) OR (symposium spire)) ) or ( abacus symposium semi ))".
• Adding a wildcard symbol may retrieve word variants: (( abacus ((symposium series) OR (symposium spire)) ) or ( abacus symposium semi ))*.