Perhaps you should try some spelling variations:
"ACS symposium series" » "ACS symposium sss", "ACS symposium spire", "ACS symposium ssbse"
"ACS symposium semi" » "ACS symposium sss", "ACS symposium sagt"
"acs symposium sas" » "bacus symposium sas", "das symposium sas", "lakes symposium sas", "acs symposium sans", "acs symposium sams"

Try widening your search to All Fields.

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