You can do that but the laptop needs to support RAID 0 configuration which is where data stored is shared between two drives.
I don't recommend doing this because it doubles the chances of drive failure as if either drives or laptop goes faulty you end up losing all the data as both drives need to be working to access the data.
If you are running out of space on which I assume is the SSD that has windows on it I recommend upgrading it to a 240GB or 500GB SSD. If you need to keep data there's software that usually comes with those SSDs to clone onto the replacement drive.