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Can you connect that laptop to internet using an Ethernet cable ?
Okay, press Windows Logo key and R key on your keyboard together. You will get open the Run command box. Type devmgmt.msc in the Run box and press Enter. You will get open the device manager window. Can you see any disabled devices or unknown devices listed there ?
Okay, can you see the Wifi Adapter listed in Device Manager ? Is it Aetheros or Intel ?
Okay, please shutdown that system. Wait two minutes. Now power ON the system. Try to connect to WiFi. If the problem still persists, go to http://support.lenovo.com/in/hi/products/laptops-and-netbooks/yoga-series/yoga-2-13-notebook-lenovo and download the latest driver for Atheros Adaptor. Copy the downloaded file to the Yoga system and run it to install the driver. Restart the system and check the result.