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

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 sans") OR ("acs symposium series")).
• Removing quotes may allow a broader search: (( aaas symposium sans ) or ( acs symposium series )).
• Adding a wildcard symbol may retrieve word variants: (("aaas symposium sans") or ("acs symposium series"))*.