Djvu, being a format that stores images of pages rather than text, is not going to convert well to EPub. Converting Djvu to PDF doesn't magically convert the Djvu images to text. It just creates a PDF full of images. The only way you're going to get that converted to a usable epub is if you do OCR on the images (probably easiest to do once you've converted to PDF). Of course OCR is not perfect, so after you've done the conversion you'll have to go back through the book and edit all of the mistakes it made.
If your end goal is just to be able to read your Djvu books on your Android tablet, a much better solution is to get a
Djvu reader for Android (I have no affiliation with that app, it was just the first hit when I googled for "android djvu reader").