Perhaps you should try some spelling variations:
"ACS symposium series" » "ACS symposium semi", "ACS symposium spire", "ACS symposium ssbse"
"acs symposium sss" » "bacus symposium sss", "das symposium sss", "lakes symposium sss"
"ACS 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 sas"))) OR ("acs symposium sss")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"ACS symposium series\") OR (\"ACS symposium sas\"))) or (\"acs symposium sss\"))".
• Removing quotes may allow a broader search: (((( ACS symposium series ) OR ( ACS symposium sas ))) or ( acs symposium sss )).
• Adding a wildcard symbol may retrieve word variants: (((("ACS symposium series") OR ("ACS symposium sas"))) or ("acs symposium sss"))*.