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

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 libraries) OR (spectral libraries))) OR (scientific libraries)).
• Adding a wildcard symbol may retrieve word variants: academic & ((((specialist libraries) or (spectral libraries))) or (scientific libraries))*.