Perhaps you should try some spelling variations:
"das symposion sieds" » "das symposium sieds", "das symposion des", "das symposion wien"
"acs symposium ies" » "bacus symposium ies", "lakes symposium ies", "games symposium ies", "acs symposium irs", "acs symposium ius", "acs symposium iws"
"das symposium sss" » "bacus symposium sss", "texas symposium sss", "lakes symposium sss", "das symposium sas"

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 ies") OR ((("das symposion sieds") OR ("das symposium sss")))).
• Removing quotes may allow a broader search: (( acs symposium ies ) or ((( das symposion sieds ) or ( das symposium sss )))).
• Adding a wildcard symbol may retrieve word variants: (("acs symposium ies") or ((("das symposion sieds") or ("das symposium sss"))))*.