certain - (at times followed by `to') applying to or characterized by or distinguishing something specific or special or unique; "procedures with unique software"; "calls for distinct to The task"; "a specific and detailed account of the incident"
Have you 무에타이 ever any special day in your mind ¿tienes en mente alguna fecha concreta or en individual or en especial
specially is much more idiomatic only once the intended perception is specifically The equipment was specially created for a still left-handed operator.