Perhaps you should try some spelling variations:
"aaas symposium sams" » "das symposium sams", "cas symposium sams", "gras symposium sams", "aaas symposium rams", "aaas symposium ams", "aaas symposium wams"
"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"
"texas symposium sas" » "texts symposium sas"

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