Perhaps you should try some spelling variations:
"aaas symposium series" » "aaas symposium sas", "aaas symposium sss", "aaas symposium spire", "das symposium series", "cas symposium series", "gras symposium series"
"bacus symposium semi" » "bacus symposium sas", "bacus symposium sss"
"acs symposium semi" » "acs symposium sas", "acs symposium sss", "das symposium semi", "lakes symposium semi", "games symposium semi"
"bacus symposium sagt" » "bacus symposium sas", "bacus symposium sss"

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