Perhaps you should try some spelling variations:
"das symposium series" » "das symposium semi", "das symposium sas", "das symposium spire", "bacus symposium series", "texas symposium series", "lakes symposium series"
"das symposium sss" » "bacus symposium sss", "texas symposium sss", "lakes symposium sss", "das symposium sas"
"das symposion sss" » "das symposion des", "das symposion aus", "das symposion als"

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