In case you have tried the Show Options link that is displayed on top of Google search result, it gives options timeline of which you want search results, like past year, past week, past 24 hrs and recent results. Now like many if you too are interested in finding results that Google spider crawled just a few min back, below is how you do it. the no. in last is taken as past-minutes.
http://www.google.com/search?q=your_search_query_goes_here&tbs=qdr:n10