A couple of things to keep in mind:
The vast majority of books published are never reviewed. If you exhaust the resources in this guide looking for a review, there is a good chance the book was not reviewed.
Book reviews generally appear near the time of the book's publication. A book review may include a summary of the subject of the book, a discussion of style, or comparisons with similar books. When searching for book reviews, you will need to confirm (perhaps on Amazon):