Oops, I got cut off - what I meant to end with is:

As an aside - we do have a particular kind of "smart search" around citations of the law (the US Code), so if you search for "5 USC 552", you'll receive results where that piece of law is cited in various formats, whether or not it matches your exact search:

https://scout.sunlightfoundation.com/search/federal_bills/5%20usc%20552