Hello Malou,
I came accross your post and was thinking it might not be easy to find these products.
I found this page:
http://www.activeglutenfree.com/blog/?p=36I am living in Ho Chi Minh City but often go to Hanoi. I think it is difficult but you could ask to some shops to import these kind of products for you. I realise this could be interesting for them. You can find some grocery stores in Hanoi and HCMC, some owned by foreigners. I am sure it is worth asking...
Best luck!
PS: Sorry I couldn't resist, I am bad ; )
