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"
"ACS symposium sieds" » "ACS symposium sss", "ACS symposium semi", "ACS symposium ssd"
"ACS symposium sas" » "ACS symposium sans", "ACS 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: (("acs symposium series") OR ((("ACS symposium sieds") OR ("ACS symposium sas"))))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"acs symposium series\") or (((\"ACS symposium sieds\") OR (\"ACS symposium sas\"))))*".
• Removing quotes may allow a broader search: (( acs symposium series ) or ((( ACS symposium sieds ) OR ( ACS symposium sas ))))*.