Perhaps you should try some spelling variations:
"acs symposium series" » "acs symposium semi", "acs symposium sas", "acs symposium sss", "games symposium series", "gauss symposium series", "chaos symposium series"
"lakes symposium sieds" » "lakes symposium sas", "lakes symposium sss", "lakes symposium semi"
"das symposium ii" » "das symposion ii", "texas symposium ii", "das symposium i", "das symposium ismis", "das symposium isvc"
"bacus symposium iv" » "bacus symposium isvc", "abacus symposium iv", "backs symposium iv", "baus symposium iv"
"npss symposium ii" » "npss symposium i", "npss symposium ismis", "npss symposium isvc"

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