Instinctive keywords

I don’t know if this is possible, but it would be handy.

You know when you’re using, say, and iPhone, and certain programs, or perhaps websites, if you have a phrase, for instance:

“Susan’s grandmother”

if you start typing “gra” you will be offered the phrase “Susan’s grandmother”, in which the “gra” is contained.

It would be very handy if keywords worked like this - for instance, if you have

“Jim Brody, pathologist”

if you started to type the keyword “path”, if it would offer you “Jim Brody, pathologist” (as well as other phrases like “Place:pathology lab”).

Not essential, but if it’s easy to do, this would be awfully nice.