Perhaps you should try some spelling variations:
"1975 spring ostensive" » "1975 string ostensive", "1975 springer ostensive", "1975 spring intensive", "1975 spring offensive"
"1975 spring extensive" » "1975 string extensive", "1975 springer extensive"
"1975 stronger ostensive" » "1975 stronger intensive", "1975 stronger offensive", "1975 springer ostensive", "1975 strong ostensive", "1975 strongly ostensive"

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

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