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 i" » "spaces symposium i", "lakes symposium i", "bibos symposium i", "backs symposium iv", "backs symposium isvc"
"acs symposium sieds" » "acs symposium sas", "acs symposium sss", "acs symposium semi", "lakes symposium sieds", "games symposium sieds", "gauss symposium sieds"
"acs symposium ii" » "lakes symposium ii", "games symposium ii", "gauss symposium ii", "acs symposium iv", "acs symposium ismis", "acs symposium isvc", "acs symposium ivi", "acs symposium isvci"
"bacus symposium i" » "bacus symposium iv", "bacus symposium isvc", "abacus symposium i", "baus symposium i", "bachs symposium i"

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