I think that the search options on the software we use are somewhat limited. There are 2 locations from where you can do a search, one on the home screen which produces very poor results, the other is from within a subsection such as the repair heading etc which does produce far better results.
Although I have not tried it, but I suspect that if you were look within the repair for question about the Tektronix 2465 and then did within that section if it has many pages to it, that you might get even better results perhaps, who knows?