Perhaps you should try some spelling variations:
specialist libraries » specialist librarians
scientific libraries » science libraries
spectral libraries » several libraries, spectral library
specific libraries » specific injuries
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 (((((specific libraries) OR (special libraries))) OR (((scientific libraries) OR (scientific theories)))))).
• 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 (((scientific libraries) or (scientific theories))))))".
• Adding a wildcard symbol may retrieve word variants: academic & ((((specialist libraries) or (spectral libraries))) or (((((specific libraries) OR (special libraries))) or (((scientific libraries) or (scientific theories))))))*.