Partial recovery

So I have been to Crackstation.net trying to crack a few hashes that I wasnt able to crack myself. I got a few partial match.

Can someone explain me how these partial match are obtained? is there a way to truncate a sha1 hash to get that partial result or is it something else? I have an example but I cant post it because its against the rule of this site.

But if anyone has any info on the matter Im all ears


thank you in advance.