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

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