Hi mizanurra.
I tried looking up a latin name for rosy adenium but did not find one.
Is one of these Adeniums what you are looking for?
http://garden.org/plants/searc...
If you see the one you want, and someone listed their name with that plant, saying they "Have" it and "will trade", you could contact them directly.
Or, if you pick out which one or which ones you are interested in, we might be able to find a seed or plant vendor who ships to Bangladesh.