Perhaps you should try some spelling variations:
"das symposium series" » "das symposium semi", "das symposium sas", "das symposium sss", "das symposion series", "bacus symposium series", "texas symposium series"
"das symposium sieds" » "das symposium sas", "das symposium sss", "das symposium semi", "das symposion sieds", "bacus symposium sieds", "texas symposium sieds"
"acs symposium iv" » "bacus symposium iv", "lakes symposium iv", "games symposium iv", "acs symposium isvc"

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: (("acs symposium iv") OR ((("das symposium sieds") OR ("das symposium series"))))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"acs symposium iv\") or (((\"das symposium sieds\") OR (\"das symposium series\"))))*".
• Removing quotes may allow a broader search: (( acs symposium iv ) or ((( das symposium sieds ) OR ( das symposium series ))))*.