Perhaps you should try some spelling variations:
"1975 string offensive" » "1975 strings offensive", "1975 spring offensive", "1975 steering offensive", "1975 string defensive", "1975 string ostensive"
"1975 string offense" » "1975 strings offense", "1975 spring offense", "1975 steering offense"
"1975 string offences" » "1975 strings offences", "1975 spring offences", "1975 steering offences", "1975 string offence", "1975 string offenders"

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: (("1975 string offensive") OR ((("1975 string offense") OR ("1975 string offences"))))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"1975 string offensive\") or (((\"1975 string offense\") OR (\"1975 string offences\"))))~".
• Removing quotes may allow a broader search: (( 1975 string offensive ) or ((( 1975 string offense ) OR ( 1975 string offences ))))~.
• Adding a wildcard symbol may retrieve word variants: (("1975 string offensive") or ((("1975 string offense") OR ("1975 string offences"))))*.