Having found "Buro Happold" as author of a presentation, we use full text search to see if there is more material of interest.
Within our current constraints the additional search [1] reduces our result set to 2 [2]. But we may note that the Powerpoint referred to by the "has index" = presentation1.ppt [3] is not among these search results. Why is that? Next, we'll locate that Powerpoint, to see whether "Buro Happold" appears in its text...