A search with two paths in it doesn't have a case use for ANDing them directly together, I would suggest that they always just OR. This would make typing a little easier especially if the | is in an odd place on the keyboard as often the case with laptops or if you move around different keyboards.
So, D:\Folder1\ D:\Folder2\ would be treated as D:\Folder1\ | D:\Folder2\
(Thank you void for all the other replies, as ever always appreciated; I always read them, but tend to avoid short rejoiners so as to keep any solutions as the final comment on a thread, and to avoid generating extra notifications
)David