So these are Lenovo Miix 320? What country were they made for and where are they deployed?
I work at a university in US and every once in a while I see a student from an Asian country with a laptop that does not see our WIFI, or can see it but can't join it. We tell them to get a USB wifi dongle and things work ok.
I don't want to venture too much in this territory, but different regions use different radio spectrum.
Also... can you take one of these to a different location to see if you get WIFI? Can you share your phone's wifi to see if the PC can see your phone's wifi?