The search utility lets you search the keywords in all the HTML files in Books Online. Use the following options to narrow your search:
Within the Index, if the term is not listed under a specific alphabet, use the Find or Search option from the browser and search the sub-section of the keyword you are searching for.
For example: If you are looking for the word Encryption under the alphabet E, searching for the word Encryption using the browser' search option will locate the word listed under Data Encryption.