In a case like that, going to his profile page and clicking to view all the posts made by him would have produced it pretty quick because those results are in fact ordered by date.
When you have a specific thing you're looking up, they are almost always sorted by date.
When you have a text search it is almost never sorted by date but rather closest match, and that can't be altered without significantly losing the strength of the search engine, which is something I'm not keen on doing.
If there are other browsing options I can create, though, I'll be glad to consider them!
