I'll get straight to the point: I do not own any Miyu-related manga books, so please do not e-mail me asking to put more manga on my website. What I have here is everything I have found through IRC and DC++. All Vampire Princess Miyu and Yui books (except VPM vol 1 ch 1) are Selene Scans scanlations (they are dropped projects, do not expect the continuation ;_;). The rest of it (Shin VPM and VPM vol 1 ch 1) are Studio Iron Cat releases.
Note: Manga must be read from right to left. However, the pages from the Studio Iron Cat releases are flipped so you can read them from left to right. You can tell if a page is flipped because Miyu's hair is tied up on the right side of her head instead of the left side (excluding covers).
Also, it's recommended that you read the Miyu-related manga in the order they have been released: Vampire Princess Miyu vol 1 > Shin Vampire Miyu > Vampire Princess Miyu vol 2-10 > Vampire Yui.