Perhaps you should try some spelling variations:
symposium series » symposium semi, symposium sas, symposium sss
aaas symposium » das symposium, cas symposium, gras symposium
acs symposium » bacus symposium, das symposium, lakes symposium
sas » sans

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