1. The device search process is an interaction between your phone and the earbuds. There might be Bluetooth logic issues on the phone side, causing it to be unable to find the earbuds. This is not an issue with the earbuds. Try turning off and then turning on your phone's Bluetooth, or restart your phone and try searching again.
2. If the problem persists, place both earbuds in the charging case, close the lid, and wait for more than 30 seconds to let the earbuds hard reset. Alternatively, you can open the lid, press, and hold the function button for more than 10 seconds to perform a factory reset and then try pairing again.