Bluetooth device not found

I am using assus vivobook s551ln laptop. Can't connect Bluetooth.

Can you please post the output of

sudo lshw -C network

You may be using mediatek or azurewave...
Can you also post the output of

sudo dmesg | grep -i bluetooth

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sudo dmesg | grep -i bluetooth:
show nothing

sudo lshw -C network
*-network
description: Ethernet interface
product: RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller
vendor: Realtek Semiconductor Co., Ltd.
physical id: 0
bus info: pci@0000:02:00.0
logical name: enp2s0
version: 10
serial: 10:c3:7b:b1:1e:25
capacity: 1Gbit/s
width: 64 bits
clock: 33MHz
capabilities: pm msi pciexpress msix vpd bus_master cap_list ethernet physical tp mii 10bt 10bt-fd 100bt 100bt-fd 1000bt-fd autonegotiation
configuration: autonegotiation=on broadcast=yes driver=r8169 driverversion=5.15.0-48-generic firmware=rtl8168g-3_0.0.1 04/23/13 latency=0 link=no multicast=yes port=twisted pair
resources: irq:18 ioport:e000(size=256) memory:f7904000-f7904fff memory:f7900000-f7903fff
*-network
description: Wireless interface
product: MT7630e 802.11bgn Wireless Network Adapter
vendor: MEDIATEK Corp.
physical id: 0
bus info: pci@0000:03:00.0
logical name: wlp3s0f0
version: 00
serial: 54:35:30:73:c9:9f
width: 32 bits
clock: 33MHz
capabilities: pm msi pciexpress bus_master cap_list ethernet physical wireless
configuration: broadcast=yes driver=mt76x0e driverversion=5.15.0-48-generic firmware=1.0.07-b370 ip=192.168.78.148 latency=0 link=yes multicast=yes wireless=IEEE 802.11
resources: irq:19 memory:f7800000-f78fffff

Ok, so you have mediatek...
While this developer has moved on to browner pastures, the files should still work:

You can try installing them with DKMS to ensure that kernel upgrades continue to work:

sudo apt-get install git dkms build-essential

git clone https://github.com/neurobin/MT7630E.git

cd MT7630E/

sudo make dkms

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