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DjVu doesn't contain text, it works on images, and that's your problem. It uses an image-compression technology that's highly optimised for text and allows far smaller file sizes than other formats that target more general image types.
You could export the images and OCR them (lots of work to catch the errors), or you could try slapping the images all together as-is (which is what you describe above, possibly with some down-ressing to make it look even worse). Go back to the author and get a file that contains text, because DjVu is useless for your purpose.
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