jdMorgan - 5:03 am on May 21, 2006 (gmt 0)

Giulio,

I wouldn't worry too much if I were you. Despite the statements that Google can't possibly determine relevance, they're well on the way: Google Sets [labs.google.com] for hotels+car rental+airlports+Restaurants+las vegas

They consider those results highly relevant, yet they vary more widely than your examples do. The common element, of course, is "travel."

Google purchased a company called "Applied Semantics" several years ago (ca. 2002). They are almost certainly using the ideas they bought with it.

Jim