when you are saying them, draw them out, make them last your whole breath. when your vocal cords vibrate, if done at the right pitch, you should feel the vibration in that chakra. if you cant, still try.
with the thoth vibration, you are supposed to say the whole word at the same time, the th, and the o sound. if that doesnt make sense, maybe someone else can explain it better than i. wouldnt doubt it.
