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