teledymag.com allows the user to perform powerful searches.  To get the best results, remember following few rules:

1)  The main search looks for matches on Company Name, Address and Telephone Number and also tries to match Classification headings.  If there are classifications that match your search there will be a "Go To Classification Matches" link to the top left of the results.

2) Partial information (such as entering "dyma" or "tele" instead of "Teledymag") can often yield better results.

3)  If you are looking for a company that deals in specific areas, look through the classifications, either by using the alphabet or entering text that is likely to be similar to a classification heading.