If you have ebooks on eBooks+ you can search within your Bookshelf, as follows:

1. Go to your Bookshelf (top left icon) on the black bar.
2. On the right of the black bar there is a Search field.
3. Start typing the name of the book you want, or the name of one of its authors.

If there is an exact match the search will prompt you. If there is a near match it will come back in the search results.

You are not yet able to search your ancillary content.