OneNote 2010 lets you easily search through every included element. Since it indexes all the element in notebooks section, you can find any type of element including text, images, audio recordings, videos, embedded files, etc.
To search a specific text, image, open any section of notebook, from top-right corner of notebook, enter keywords in search pane. It will instantly show notebooks’ sections, containing search keyword either in title or in main body. Click the desired notebook for quick access to search keyword in it.