Perhaps you should try some spelling variations:
"das symposium series" » "das symposium semi", "das symposium sss", "das symposium spire", "das symposion series", "texas symposium series", "lakes symposium series"
"acs symposium sieds" » "acs symposium sss", "acs symposium semi", "acs symposium ssd", "lakes symposium sieds", "games symposium sieds", "gauss symposium sieds"
"bacus symposium irs" » "bacus symposium iv", "bacus symposium i", "bacus symposium iii", "abacus symposium irs", "backs symposium irs", "baus symposium irs"
"acs symposium ii" » "lakes symposium ii", "games symposium ii", "gauss symposium ii", "acs symposium iv", "acs symposium i", "acs symposium ismis"
"das symposium sas" » "das symposion sas", "texas symposium sas", "lakes symposium sas", "das symposium sans", "das symposium sams"

You may be able to get more results by adjusting your search query.

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