Perhaps you should try some spelling variations:
"sources symposium series" » "studies symposium series", "southwest symposium series", "solids symposium series", "sources symposium semi", "sources symposium sas", "sources symposium sss"
"acs symposium series" » "acs symposium semi", "acs symposium sas", "acs symposium sss", "bacus symposium series", "das symposium series", "lakes symposium series"

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: (("sources symposium series") OR ("acs symposium series")).
• Removing quotes may allow a broader search: (( sources symposium series ) or ( acs symposium series )).
• Adding a wildcard symbol may retrieve word variants: (("sources symposium series") or ("acs symposium series"))*.