I love Logos and have used it for many years, but one of my frustrations, at times, is figuring out the best way to search for some random information. Very often I will find that it is easier to go to Google and find the answer that way, which obviously defeats the purpose of using Logos... 
So, some help from all the resident experts please: what I wanted to know was whether or not I have, in my substantial library (6083 books), more detailed information specifically about 7-year madness of King Nebuchadnezzar. Who would have reigned in his place? Was it written about in any other historical records, outside or inside the church?
QUESTION: how would you go about doing such a search? Perhaps by seeing how more seasoned researchers go about it, I'll become a better Logos searcher myself.
Thanks all! In case it's helpful, I have Logos 7 with the Full Feature Set.