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