Fetch Item does not search for records in the same way as a regular Primo search, which may return many results. Instead, it allows you to specify metadata (such as a title, ISBN, ISSN, and so forth) for a specific book, article, or journal to retrieve the item's available services (such as full text or ILL). Because the link resolver returns services based on its own information, it may also return services that are not indexed in your institution's catalog. In addition, the link resolver may offer other services (such as to purchase or request items that your library does not hold).
The Fetch Item page provides a tab for books, journals, and articles so that you can specify search criteria (such as volume, author, and so forth) for the selected citation type.

Fetch Item Page - Article Tab