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

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