To not harm (nonmaleficence) is to avoid bringing things that are harmful to other. Both the body and the mind, whether direct or indirect, including careful risk will occur.
Do no harm (Nonmaleficence) is to avoid bringing anything harmful to others. Both the body and the mind Whether directly or indirectly. You must be aware of the risk of harm to occur.
No harm (nonmaleficence). Is to avoid not bring something harmful to others, both in mind and body, whether directly or indirectly. As well as careful risk of potential dangers.