There are three main notebook searches you can perform:
1. Search by Name:
With this search you cycle through the cards in the current page, looking for a name match.
2. Search by Focus:
This looks for matching focus. A similar effect can be achieved by setting the focus on the Format Toolbar and moving through cards with this.
3. Search Text:
This will only search through the current card, much as a normal word processor searches for text. The found word will be hi-lighted.
With any of these searches you can match case and whole word.