I should have known better: to show-off my new Logos Bible Study software to my brother (who uses E-Sword).
He typed in Aleph Taph into the search window, and............nothing, nada, zilch.
My brother left with his faith in his trusty E-Sword intact.
Even after he left, and I typed Aleph Tav instead - I still didn't get a result.
What am I doing wrong.