Yes a lot of effort has gone into developing treatments. The term vaccine is often used in the press to refer to all sorts of different treatments, such as anti-viral drugs. Actual vaccines are tricky, we know a lot about influenzas for example and have a wide variety of the viruses to study and experiment with and understand how to develop vaccines against new strains pretty quickly. There has never been a successful vaccine against Coronavirus family viruses though, they seem a lot harder to target effectively.