Perhaps you should try some spelling variations:
"backs symposium series" » "backs symposium sas", "backs symposium sss", "backs symposium spire", "bacus symposium series", "acs symposium series", "lakes symposium series"
"spaces symposium series" » "spaces symposium sas", "spaces symposium sss", "spaces symposium spire", "sources symposium series", "spanish symposium series", "bacus symposium series"
"backs symposium semi" » "bacus symposium semi", "acs symposium semi", "lakes symposium semi", "backs symposium sas", "backs symposium sss"
"backs symposium sagt" » "bacus symposium sagt", "acs symposium sagt", "lakes symposium sagt", "backs symposium sas", "backs symposium sss"

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