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