Perhaps you should try some spelling variations:
"das symposion series" » "das symposium series", "das symposia series", "das composition series"
"backs symposium irs" » "spaces symposium irs", "lakes symposium irs", "bibos symposium irs", "backs symposium iv", "backs symposium i", "backs symposium iii"
"acs symposium ii" » "das symposium ii", "lakes symposium ii", "games symposium ii", "acs symposium iv", "acs symposium i", "acs symposium ismis"
"acs symposium sss" » "das symposium sss", "lakes symposium sss", "games symposium sss", "acs symposium sas"
"bacus symposium ii" » "bacus symposium iv", "bacus symposium i", "bacus symposium ismis"

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: (((("backs symposium irs") OR ((("acs symposium ii") OR ("bacus symposium ii"))))) OR ((("acs symposium sss") OR ("das symposion series")))).
• Removing quotes may allow a broader search: (((( backs symposium irs ) or ((( acs symposium ii ) or ( bacus symposium ii ))))) or ((( acs symposium sss ) or ( das symposion series )))).
• Adding a wildcard symbol may retrieve word variants: (((("backs symposium irs") or ((("acs symposium ii") or ("bacus symposium ii"))))) or ((("acs symposium sss") or ("das symposion series"))))*.