Perhaps you should try some spelling variations:
"1975 string offensive" » "1975 spring offensive", "1975 steering offensive", "1975 striking offensive", "1975 string defensive", "1975 string offense", "1975 string ostensive"
"1975 strings offensive" » "1975 springs offensive", "1975 steerings offensive", "1975 strikings offensive", "1975 strings defensive", "1975 strings offense", "1975 strings ostensive", "1975 settings offensive"
"1975 strings extensive" » "1975 springs extensive", "1975 steerings extensive", "1975 strikings extensive", "1975 settings extensive"

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("1975 string offensive") or ((("1975 strings offensive") or ("1975 strings extensive"))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("1975 string offensive") OR ((("1975 strings offensive") OR ("1975 strings extensive")))).
• Removing quotes may allow a broader search: (( 1975 string offensive ) or ((( 1975 strings offensive ) or ( 1975 strings extensive )))).
• Adding a wildcard symbol may retrieve word variants: (("1975 string offensive") or ((("1975 strings offensive") or ("1975 strings extensive"))))*.