Perhaps you should try some spelling variations:
"das symposium irs" » "das symposion irs", "bacus symposium irs", "texas symposium irs", "das symposium i", "das symposium ii", "das symposium iii"
"das symposium iv" » "das symposion iv", "bacus symposium iv", "texas symposium iv", "das symposium isvc"
"acs symposium sas" » "bacus symposium sas", "lakes symposium sas", "games symposium sas", "acs symposium sans", "acs symposium sams"

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