I'm looking for a bluetooth dongle but can't find it using google does any body here can show me a place where I can get that please? Thanks in advance.

Something like this :
https://www.google.com/search?q=csr+4.0 ... 32&bih=611

Try the computer shops on street Kampuchea Krom.
Here is one such shop advertising USB Bluetooth dongles:

https://www.khmer24.com/en/orico-usb-bl ... 78751.html

I haven’t been to this particular shop. In any case, there are plenty more shops on that street.