Perhaps you should try some spelling variations:
"bacus symposium series" » "bacus symposium sas", "bacus symposium sss", "bacus symposium spire", "abacus symposium series", "backs symposium series", "baus symposium series"
"das symposion series" » "das symposia series", "das composition series", "das symposion veranst"
"lakes symposium semi" » "lakes symposium sas", "lakes symposium sss", "lakes symposium sagt"

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: (("bacus symposium series") OR ((("lakes symposium semi") OR ("das symposion series")))).
• Removing quotes may allow a broader search: (( bacus symposium series ) or ((( lakes symposium semi ) or ( das symposion series )))).
• Adding a wildcard symbol may retrieve word variants: (("bacus symposium series") or ((("lakes symposium semi") or ("das symposion series"))))*.