... provides hin.traineddata for recognizing texts in devanagari scripts. However the Hindi training texts, images and box files are not provided, so it is difficult to improve the accuracy by further improving the traineddata. It is noted that recognition is more accurate and faster if the training is done with the same /similar font as used in the text to be OCRed.
See https://sourceforge.net/p/tesseracthindi/wiki/OCR%20for%20Devanagari/ for more details.