All those CoAs are from the famillies that existed in the VERY late 14 century and,in the case of Lazarevic Ordo Draconis,first quarter of 15 century. It is important to note that NONE of this CoAs is found in any contemporary sources,but date from later period.
As for "The Nemanjics",which Vlad Felix was so kind to post,it is simply derived from the upper Ordo Draconis.
This is more likely to be coat of arms thet belonged to despot Stefan. Note the "despot crown" on the top of shield. This CoA even makes sense. Unfortunatelly,we do not know the exact colours.