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", "lakes symposium series"
"spaces symposium sams" » "sources symposium sams", "spanish symposium sams", "bacus symposium sams", "spaces symposium sas", "spaces symposium rams", "spaces symposium ams"

You may be able to get more results by adjusting your search query.

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