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

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