American trained pilots have never heard of IVRS.
False. I note that your wind up act continues, TC.
That said, Prouty has a decent suggestion.
I propose dropping both terms and substituting "thrust instability" for the vortex ring phenomenon and "running out of power" for the other.
Problem is, one has difficulty in putting a genii back into a bottle.
The other issue is to know your aircraft's characteristics thoroughly (as pointed out in numerous threads on this topic previous to this edition).