And this one?
START + a
(then a, again a, backspace 3 times, all without pressing START)
START + a will search for "keywords" (variable & routine names) containing "a"; pressing "a" again, will find all keywords containing two "a"; same after the third "a". Deleting the 3 a by pressing backspace it will show "all".
You can press any letter key, of course.