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

You may be able to get more results by adjusting your search query.

• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"aaas symposium sas\") OR (\"texas symposium sans\"))) OR (\"acs symposium semi\"))".
• Removing quotes may allow a broader search: (((( aaas symposium sas ) OR ( texas symposium sans ))) OR ( acs symposium semi )).
• Adding a wildcard symbol may retrieve word variants: (((("aaas symposium sas") OR ("texas symposium sans"))) OR ("acs symposium semi"))*.