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

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 (special libraries))))) OR (scientific libraries)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "academic & ((((specialist libraries) or (((spectral libraries) OR (special libraries))))) or (scientific libraries))".
• Adding a wildcard symbol may retrieve word variants: academic & ((((specialist libraries) or (((spectral libraries) OR (special libraries))))) or (scientific libraries))*.