Can't detect most network my ASUS windows 8 laptop is supposed to detect.?

Can't detect most network my ASUS windows 8 laptop is supposed to detect. My home has 3 routers, a main and two extension. Most of the time I connect to my home network via one of the extension routers. I've just moved my laptop to another room and tried to connect to my home network via the main router. However, my home network and many other networks around weren't on the list, except a few unknown networks. I tried rebooting the laptop but nothing has changed. I can't even identify whether it's my router's problem or my laptop. Please help.

更新1:

Just moved back to my room and even the three unknown networks shown are gone and no network is shown in the list. I've been using the 3 routers in this house for almost 4 years. It used to connect just fine via whatever router but recently I started having problem connecting to different routers. Right now I'm connecting my laptop using Ethernet connection. Checked my DCHP settng and it says enabled. FYI the wireless card of my laptop is Qualcomm Atheros AR946x. Please advice. Thanks a lot!

Can't detect most network my ASUS windows 8 laptop is supposed to detect.?

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