Check the model number and description. I can't locate anything for the details you have provided.
Once you have the correct model and description, search for regards offering that item. Screwfix and B&Q are both good sources of cheap Chinese pile 'em high and sell 'em cheap tat. Their customer service may be able to help with a manual if you can't find one online.
howtomendit.com for free repair help, information and advice.
Try fixfault.com to fix drills.