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

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