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

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 ("acs symposium series"))*.
• Removing quotes may allow a broader search: (( aaas symposium sas ) or ( acs symposium series ))*.