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