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