Perhaps you should try some spelling variations:
"das symposium series" » "das symposium semi", "das symposium sas", "das symposium sss", "das symposion series", "texas symposium series", "lakes symposium series"
"backs symposium irs" » "spaces symposium irs", "lakes symposium irs", "bibos symposium irs", "backs symposium iv", "backs symposium i", "backs symposium iii"
"acs symposium sams" » "acs symposium sas", "acs symposium rams", "acs symposium ams", "lakes symposium sams", "games symposium sams", "gauss symposium sams"
"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 ("bacus symposium ii"))) OR ((("acs symposium sams") OR ("das symposium series")))).
• Removing quotes may allow a broader search: (((( backs symposium irs ) or ( bacus symposium ii ))) or ((( acs symposium sams ) or ( das symposium series )))).
• Adding a wildcard symbol may retrieve word variants: (((("backs symposium irs") or ("bacus symposium ii"))) or ((("acs symposium sams") or ("das symposium series"))))*.