Perhaps you should try some spelling variations:
virtual library » virtual laboratory
vision library » design library, visual library, asio library
vision linear » piston linear, emission linear, von linear
gson library » own library, town library
open library » chosen 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: %22theory AND ((((((vision library) OR (vision linear))) OR (virtual library))) OR (((gson library) OR (open library))))%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%22theory and ((((((vision library) OR (vision linear))) or (virtual library))) or (((gson library) or (open library))))%22".
• Adding a wildcard symbol may retrieve word variants: %22theory and ((((((vision library) OR (vision linear))) or (virtual library))) or (((gson library) or (open library))))%22*.