Maybe you're too far from the Wifi connection and router, because my Wifi doesn't work when I'm not in the room the router is located and if I'm standing infront of the router I only get 2 Wifi bars rather than the usual 3, if I'm in another room I get none or only 1. If you're more than maybe 15m away from your router you won't have a solid connection or no connection and it won't pop-up in search so get infront of your Wif router.
Many Thanks,
ASSASINATERZ