To search for books, use the OneSearch tool.
Click 'Advanced Search', then select 'Any Field' to see a drop-down list of all possible search fields which you can specify for searching, for eg. search by Title, Author, Subject or ISBN.
Select 'ISBN' and type in the complete ISBN number; hyphens are not necessary.
It's possible that the book you need is in OneSearch but its ISBN number isn't in the OneSearch record. So in case you don't find the book by its ISBN, double-check by searching by title or author.