The Search Tab is the part of the Book View that lets you find other pages where you used a case name, character name, or any other particular term. It can not find the section symbol, but can find numbers.
Accessing the Search Tab: in authoring mode, select the Search Tab from the tabs at the left of your screen or select Edit-Find Text from the menu bar.

This feature is very useful as an authoring tool because it allows you to maintain continuity of character names in your questions. It also allows you to check to see if you've covered a topic yet in your lesson. The feature does not allow for a global search and replace command.