Bluetooth dongle support for Ubislate 9ci tablet
According to some sources, Bluetooth dongle support was added in Android 4.2.2, and it requires some effort from the ROM developers, so it's not in every Android version. You should either ask the manufacturer for a ROM that supports BT dongles, or try to find a custom ROM like CyanogenMod for your device that has the support.

Sources: Does Android 4.2.2 support usb bluetooth dongle?

Bluetooth dongle via OTG