More on Ancestry's Search (dys)Function

In case you were wondering how feeble Ancestry's search function can be, I decided to do a test today on an individual I was researching:

Ancestry's search of this particular book, History of Dakota Territory, encompasses all five volumes. I tried to search for my individual, A. S. Jones:



Here's the result I got:



Here's the search results I got performing the same search, solely on Volume II of the book, in Google Books (the photo shows you the first of fifteen accurate search results):



Here is the first search result instance, shown above from Google Books, as found in the volume on Ancestry (it's the last name on the right-hand side, second line from the bottom):



So what's going on here?