About permission of all your Hetalia doujinshi. Hello, I'm a translator from Vietnam. We find your work very interesting and have high quality to it. So, we would like you to give us permission to use your work on our project of translating this series to Vietnamese. We look forward to your reply. Thank you for your trouble reading this :)
I’m extremely flattered that you took the time to ask me, but I’m afraid you’re asking the wrong person! I don’t own any of these doujinshi, nor do I translate any of them. I just post them/reblog them on one blog for people to see, and so they don’t have to look everywhere.
I suggest finding the original translators or even original writers to ask, not me. :)