This was a deliberate design decision arising from a query performance constraint. The reason is because one executes a very quick "Search as you Type" quicksearch on the title itself, and the other is a more complete search.
For performance reasons, since a query is executed on every single keystroke in the QuickSearch (on the BigOven for WIndows home page), it needs to take a couple indexing shortcuts in the database. It's meant to be a very quick "most popular" search. It would simply take too long to execute such a search on every keystroke. For the most complete search, use the "Find" button in the toolbar.