Use AND, OR, NOT in your search. The search screen can be tailored to your company's needs, with security, searching, and database help specific to your data and your situation. We have some help on search operators too, if you want a technical explanation. Download Concordance Web Server.
Concordance can search multiple databases.
Select one or more databases, then enter your search and see what Concordance returns. Click on a database name for help on that database. You can create almost any search form you wish.