Perhaps you should try some spelling variations:
"acs symposium series" » "acs symposium semi", "acs symposium sas", "acs symposium sss", "das symposium series", "games symposium series", "gauss symposium series"
"bacus symposium series" » "bacus symposium semi", "bacus symposium sas", "bacus symposium sss"
"backs symposium sams" » "spaces symposium sams", "bibos symposium sams", "das symposium sams", "backs symposium sas", "backs symposium rams", "backs symposium ams"
"lakes symposium sams" » "lakes symposium sas", "lakes symposium rams", "lakes 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: (((("acs symposium series") OR ("bacus symposium series"))) OR ((("backs symposium sams") OR ("lakes symposium sams")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"acs symposium series\") or (\"bacus symposium series\"))) or (((\"backs symposium sams\") OR (\"lakes symposium sams\"))))".
• Removing quotes may allow a broader search: (((( acs symposium series ) or ( bacus symposium series ))) or ((( backs symposium sams ) OR ( lakes symposium sams )))).
• Adding a wildcard symbol may retrieve word variants: (((("acs symposium series") or ("bacus symposium series"))) or ((("backs symposium sams") OR ("lakes symposium sams"))))*.