How can I use Type.GetType() with List'1[UnityEngine.Vector3]?

I am currently using:

    public static Type FindType(string qualifiedTypeName)
    {
        Type t = Type.GetType(qualifiedTypeName);

        if (t != null)
        {
            return t;
        }
        else
        {
            foreach (Assembly asm in AppDomain.CurrentDomain.GetAssemblies())
            {
                t = asm.GetType(qualifiedTypeName);
                if (t != null)
                    return t;
            }
            return null;
        }
      

kudos to @Alistar from this post : Type.GetType not working
However, even this doesnt work when it comes to a list of Vector3s from UnityEngine.
I know that you can include the relevant assembly also by adding ", UnityEngine" at the end, but it doesnt work.

Any ideas?