Put the video cameras on different settings. Try the EVP audio taping methods. Use anything that you think might have an effect on the ghosts. If nothing seems to be happening you might try to shake things up by playing religious music or by reciting prayers. On any ghost hunt make sure to have packed plenty of snacks, drinks and maybe a board game.
Ghost hunts can be long and tedious.
You may have to spend several weeks inside at a haunted location before you experience anything strange.