There is Basic and Advanced Search mode. The Advanced Search screen lets you select a combination of terms from different fields, and multiple terms from one field. Relationships among multiple terms are defined by choosing the appropriate radio button. The variety of Boolean, proximity and positional operators within the keyword and title word fields provide excellent tools for calibrating a query. Unprefixed terms must precede the prefixed ones.
Results are relevance ranked.
The software provides automatic stemming for different word endings. This is not as comprehensive as the word variant algorithm of KnowledgeFinder, but it is a capable feature. The interface and search engine are so good that it is worthwhile to mention a few things that I believe could make them even better. I would space the fields a little farther apart. I would juxtapose the boxes for concept terms, marketing terms, and industry terms, and place the labels identifying them on the top of the boxes.