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

Try widening your search to All Fields.

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