How to Search an iBook on the iPad mini
If you want to find a passage in a book on your iPad mini but just can’t remember where it is, try searching for it. Here’s how:
Tap the magnifying glass Search icon to enter a search word(s) or page number on the virtual keyboard that slides up from the bottom.
All the occurrences in the book turn up in a window under the Search icon, complete with a few lines of text and a page citation.
Tap one of the items to jump to that portion of the book.
The words you were searching for are highlighted on that page.
You can also search the web (via Google) or the Wikipedia online encyclopedia by using the corresponding buttons at the bottom of the search results. If you do so, the iBooks app closes, and the Safari browser fires up Google or Wikipedia, with your search term already entered.
If you search Google or Wikipedia in this fashion, you are, for the moment, leaving the iBooks application and opening Safari. To return to the book you’re reading, you must return to the app, which is still open and running in the background. Fortunately, you’re brought back to the page in the book where you left off.
Google is still the search choice through iBooks, even if you selected another search engine in Safari.