Perhaps you should try some spelling variations:
"bacus symposium series" » "bacus symposium semi", "bacus symposium spire", "bacus symposium ssbse", "abacus symposium series", "baus symposium series", "bachs symposium series"
"backs symposium sss" » "acs symposium sss", "spaces symposium sss", "bibos symposium sss"
"lakes symposium sas" » "lakes symposium sans", "lakes symposium sams"

You may be able to get more results by adjusting your search query.

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