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

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