I would like you to copy the original title with the mathematical bold characters and past it as it is to a post in this forum.
Like that the rest of the world would have access to that what you currently see locally on your PC.
But in general: I doubt that there is any other way than to simply retype the title with a non-bold typeface.
See e.g. this thread which circled around special characters that should actually be kept (but weren't)