Thanks, Seng Kiat.
The link did not work for me. However, the link under the other topic did work. So, it could be just me.
But in case others run into the same issue, here is Seng Kiat’s link that did work for me:
Tipitaka Search
Here are the results for “hadayavatthu”
This seems to be a great tool.
Much merits to Seng Kiat!