Perhaps you should try some spelling variations:
specialist librarians » specialist libraries, special libraries
scientific libraries » specific libraries, scientific theories, science libraries
spectral » spectrum

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: academic & ((((specialist librarians) OR (((several libraries) OR (spectral library))))) OR (scientific libraries)).
• Adding a wildcard symbol may retrieve word variants: academic & ((((specialist librarians) or (((several libraries) or (spectral library))))) or (scientific libraries))*.