Suppose you are researching a topic you are not familiar with, and you can think or four or five keywords for the topic,but you don't know which combinations of those keywords will produce results. Instead of painstakingly trying many keyword combinations, you can issue a single query with all the keywords. If it produces zero results, Noflail Search will identify combinations of keywords that do produce results for you, and list them (in a box that appears at the bottom of the Search Hisotry panel) together with the cardinalities of their result sets. You can then access each of their results sets with a single click.
Notice however that cooperative responses are not produced for queries with six or more terms, to avoid placing too big a computational load on the background.
This technique is most likely to be useful when searching within a site. In the Web at large there are many pages that contain huge collections of unrelated words; a combination of four or five keywords is therefore unlikely to produce zero results.