"The orators want to find the book."
Translation:Oratores volumen invenire volunt.
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I think it should be. Report it if it comes up again.
"Librum" is the accusative singular for "liber" when this means "book" in English.
It doesn't appear that there is any context in this Duolingo exercise to distinguish between "liber" and "volumen."
But I'm not entirely certain what the difference is between these, so I might be missing something.
You are right that the Duolingo team is not distinguishing between "liber" and "volumen", but they are not synonymous.
"Volumen" is a scroll. "Liber" is a book, or a bound collection of scrolls.
Volumen and volumina can both be used as the forms for the subject (nominative), direct object (accusative), or direct address (vocative). They only differ in number.
Volumen - singular form: book/scroll
Volumina - plural form: books/scrolls
Invenire is the infinitive 'to find'. This is used instead of inveniunt here since our main verb is volunt, 'they want'. The same thing is done in English when an action is desired: an infinitive is used with a the verb 'want'
Invenire volunt - 'They want to find'
Inveniunt - 'They find' or 'they are finding'
Professores volumina in bibliotheca inveniunt - 'They find books in the library' - They are doing the 'finding' action currently and they are looking for multiple books.
Oratores volumen invenire volunt - 'The orators want to find a book' - They desire to the the 'finding' action and it is a single book they are looking for.