Perhaps you should try some spelling variations:
"backs symposium series" » "backs symposium semi", "backs symposium sas", "backs symposium sss", "bacus symposium series", "acs symposium series", "spaces symposium series"
"backs symposium sams" » "bacus symposium sams", "acs symposium sams", "spaces symposium sams", "backs symposium sas", "backs symposium rams", "backs symposium ams"

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