mportly

Yes, that is the only way I can get to the troubleshooting I think.  Those steps (option 2, not option 1) seem to work just fine but doesn't 'stick'.  I'll check again in a few days using the same search term and see if the problem recurs and then submit a ticket.  This happens so often I've saved a clip of your instructions, but I don't use search often enough to have the steps memorized.  I have probably reindexed 7 times or so in the past year.

The full index rebuild posted by @DTLow works every time.  My issue is that I have to perform this often, almost every time I try a search on any given day.  This is not a large database, less than 1500 notes.  Is this just part of administrative overhead of using Evernote on a Mac?