Perhaps you should try some spelling variations:
2c mechatronics » c mechatronics, etc mechatronics, 1 mechatronics
_ mechatronics » _ mechanics
26 robotics » 6 robotics, 26 robotic, 16 robotics
2 robotics » _ robotics, 2 robotic, 6 robotics
a robotics » _ robotics, a robotic

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: %22control%((((2 robotics) OR (a robotics))) OR (26 robotics))%((2c mechatronics) OR (_ mechatronics))%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%22control%((((2 robotics) or (a robotics))) or (26 robotics))%((2c mechatronics) OR (_ mechatronics))%22".
• Adding a wildcard symbol may retrieve word variants: %22control%((((2 robotics) or (a robotics))) or (26 robotics))%((2c mechatronics) OR (_ mechatronics))%22*.