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