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" » "das symposium sams", "cas symposium sams", "gras symposium sams", "aaas symposium rams", "aaas symposium ams", "aaas symposium wams"

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 ("aaas symposium sams"))) OR ("acs symposium series"))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"aaas symposium sas\") OR (\"aaas symposium sams\"))) or (\"acs symposium series\"))*".
• Removing quotes may allow a broader search: (((( aaas symposium sas ) OR ( aaas symposium sams ))) or ( acs symposium series ))*.