'Do' and 'does' are both of those forms of the present indefinite tense of the verb 'to try and do.' Which a person you can use will largely depend upon the sentence's matter. Their usage is almost equivalent, except for a single occasion where You can utilize 'do' instead https://financefeeds.com/7-top-blockchain-projects-featuring-the-best-copyright-to-buy-right-now-before-it-lists-on-june-30/