The main purpose of bibliographic databases is to enable literature search in a specific subject and collect references to articles, books, journals, technical regulations, laws, conference proceedings, and in general scholarly publications.
Searching for databases in the BiblioUniTS search box does not mean searching in databases, as the purpose of the search box is to single out the most relevant tool, i.e. the database which will be afterwards used to do a subject search.
If you select the label “ databases” you may search by words either from the database title (e.g. Scopus) or by discipline (e.g. biology). For example, if you look for “ingegneria” (engineering)

In the results page you may find 19 available databases relevant for " Engineering":

Choose one of them and search within the database. For example, pick “ Access Engineering" and search for " steel bridge fracture":

In the results page you find 627 hits:

Not sure what database to pick? Look at the list of databases grouped by Ministry-compliant discipline classification.
For further information look at the Find articles page.