System: enter one or more keywords, separated by spaces. You can also enter part of a keyword. Does a boolean AND with all keywords
Submitted By: a user's name or e-mail (may be entered wholly or in part). Multiple names are not supported
Date: supported date formats: yyyy-mm-dd, mm/dd/yyyy. Both min and max dates are inclusive
Problems: enter one or more keywords, separated by spaces. You can also enter part of a keyword. Does a boolean AND with all keywords

Here are some search examples:

All systems with two monitors, and both video cards using Nvidia chipsets:
set number of monitors equal to 2, in the first card entry, set manufacturer to 'Nvidia' and position to 1, in the second card entry, set manufacturer to 'Nvidia' as well and position to 2.

All Win2000 systems with an Nvidia AGP card, and a PCI Matrox Millennium card:
check the Win2000 box, in the first card entry, set the manufacturer to 'Nvidia' and slot to 'AGP', in the second card entry, set the type to 'Card', the name to 'Millennium', the manufacturer to 'Matrox' and the slot to 'PCI'.