Perhaps you should try some spelling variations:
"sources symposium sans" » "studies symposium sans", "southwest symposium sans", "solids symposium sans", "sources symposium sas", "sources symposium san", "sources symposium ans"
"backs symposium series" » "backs symposium semi", "backs symposium sas", "backs symposium sss", "bacus symposium series", "acs symposium series", "lakes symposium series"
"spaces symposium sans" » "spanish symposium sans", "bacus symposium sans", "lakes symposium sans", "spaces symposium sas", "spaces symposium san", "spaces symposium ans"
"backs symposium sans" » "bacus symposium sans", "acs symposium sans", "lakes symposium sans", "backs symposium sas", "backs symposium san", "backs symposium ans"

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