Perhaps you should try some spelling variations:
"abacus symposium series" » "acs symposium series", "aaas symposium series", "spaces symposium series", "abacus symposium sas", "abacus symposium sss", "abacus symposium spire", "abacks symposium series", "abaus symposium series", "abachs symposium series"
"bacus symposium semi" » "bacus symposium sas", "bacus symposium sss", "bacus symposium sagt", "backs symposium semi", "baus symposium semi", "bachs symposium semi"

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