Perhaps you should try some spelling variations:
"put–call parity" » "put–call party", "put–call parts", "put–call part", "put–cell parity", "put–fall parity"
"put–all parity" » "put–all party", "put–all parts", "put–all part"
"put–hall party" » "put–all party", "put–hall marty", "put–hall part"

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: (((("put–call parity") OR ("put–all parity"))) OR ("put–hall party")).
• Removing quotes may allow a broader search: (((( put–call parity ) or ( put–all parity ))) or ( put–hall party )).
• Adding a wildcard symbol may retrieve word variants: (((("put–call parity") or ("put–all parity"))) or ("put–hall party"))*.