Perhaps you should try some spelling variations:
"das symposium series" » "das symposium semi", "das symposium sss", "das symposium spire", "bacus symposium series", "texas symposium series", "lakes symposium series"
"das symposion series" » "das symposia series", "das composition series", "das symposion veranst"
"das symposium sas" » "bacus symposium sas", "texas symposium sas", "lakes symposium sas", "das symposium sans", "das symposium sams"

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