Sony PRS-T2 button tap [More] [Search], and enter the keyword using the on-screen keyboard.

Reading Books
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Table of Contents
Tip

You can find the definition of a word and more at the
Wikipedia and Google Web sites. Tap and hold a word 
tap [Search]  [Wikipedia] or [Google]. The [Browser]
application will open to the Wikipedia or Google Web site
and search for the word. (A Wi-Fi network connection is
necessary. See Details.) To return to the book, press the
(Menu) button  tap [Continue Reading].
You can also directly enter the keyword for a search.
1 When viewing a book, press the (Menu)
button  tap [More]  [Search], and enter the
keyword using the on-screen keyboard.
Note

When using the Book Viewer’s keyword search, Latin
alphabet searches make no distinction between uppercase
and lowercase letters, but Cyrillic alphabet searches make
this distinction.

Searches from other than the [Books] content list, such as
from the [Collection] or [Notes]/[All Notes] lists, make no
distinction between uppercase and lowercase letters,
including when searching in Cyrillic.