Factbook - why does an entry appear in one search but not another?

DMM

I was looking for info about the book of giants. So I type "book of giants" into Factbook.

Got nothing. Same results if I use all quotes. Doesn't matter if I do book of giants or Book of Giants.

Now if I click the Shift+Enter, I get different results depending on if I use quotes.

With quotes: Nothing relevant.

Without quotes:

Now it's the top one, which opens up into the Factbook entry I was looking for.

But to add to the confusion:

So now Logos populated this in the search field. This is what came up from clicking above. "Book of Giants". Logos pre-filled this.

If I press enter on that, it will not recognize "Book of Giants", even though that's exactly how Logos has it, and instead defaults to bringing up the entry on Acts.

So here's my questions:

1. Why didn't typing in "book of giants" with or without quotes NOT directly bring up the Factbook article? Instead it brought up every other possible "book of…"
2. Once I clicked Shift+Enter, why would it make a difference whether or not the phrase was in quotes when it didn't before?
3. Why doesn't it recognize "Book of Giants" as an entry unless you open it a very specific way?

Thanks!