you can use a bluetooth dongle to add bluetooth capabilities to your notebook. it gets connected to the USB port of the notebook.
regarding hdmi port, dv6620la has an expresscard/54 slot. so, you could use this slot to add extra ports on the notebook. but i am not very sure whether "expresscard/54 slot to HDMI port" converter is available in the market. try contacting HP support team for this, as i'm not confident about it.