Perhaps you should try some spelling variations:
"acs symposium series" » "acs symposium semi", "acs symposium sas", "acs symposium sss", "das symposium series", "lakes symposium series", "games symposium series"
"bacus symposium series" » "bacus symposium semi", "bacus symposium sas", "bacus symposium sss"
"backs symposium sams" » "spaces symposium sams", "lakes symposium sams", "bibos symposium sams", "backs symposium sas", "backs symposium rams", "backs symposium ams"

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"))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"acs symposium series\") OR (\"bacus symposium series\"))) or (\"backs symposium sams\"))*".
• Removing quotes may allow a broader search: (((( acs symposium series ) OR ( bacus symposium series ))) or ( backs symposium sams ))*.