Unfortunately that is not possible.
With the vertical layout, you can use the results grouping feature, but the isosopic is not capable of that. For this to work, you need two separate search bars. What I usually see is in these types of situations, is that people tend to create two search bars, side-by-side, one to search one thing, and the other for the other thing.
If you like my products, don't forget to rate them on codecanyon :)