To search a book or document, click the magnifying glass icon in the right panel, or press Cmd+F (on Mac) or Ctrl+F (on Windows). 

In the resulting search panel, you can use syntax similar to that of a web search; enter a list of words and Perusall will return all pages or sections with any of those words. Perusall also supports a few additions:

• Place a + between words to only return pages or sections that contain all of the words
• Place a - before a word to only return pages or sections that do not include that word (e.g., dog beagle -pug)
• Wrap a phrase in double quotes (e.g., "chain rule") to search for that exact phrase
• Use a * at the end of a word to return pages or sections that start with that word (e.g., math* would match "math" or "mathematics" but not "polymath")