To require words, type + in front of each word that must be in the search results. So if you want to see pages about health issues around blackberries and you mean the BlackBerry hand-held device, search for blackberry health +device.
usenet indexer site
search in the most popular groups search in the other groups
Alt.Binaries.Nl (free, automatic content) – indexes more than 2700 popular newsgroups for 45 days. NZB’s can be generated as well. Great but Binsearch is better.
Binsearch.info (free, automatic content) – probably the best service. Keeps records of more than 6500 groups for 120 days. Advanced search options and the ability to download everything that you like as a nzb. My recommendation.
I know of some users who only work with nzb files and do not download headers anymore. We also have to distinguish between public, private and pay indexing services. While I wont talk about the private services at all I would like to point out that they are usually forums where users share their finds and uploads.