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