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

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