Perhaps you should try some spelling variations:
etc mechatronics » c mechatronics, data mechatronics, opto mechatronics
2c mechatronics » c mechatronics, _ mechatronics, 1 mechatronics
2c robotics » 26 robotics, c robotics, 2.1 robotics
29 robotics » 9 robotics, 19 robotics, 26 robotics
21 robotics » 2.1 robotics, 1 robotics, 11 robotics
2 robotics » _ robotics, a robotics, 2 robotic
22 robotic » 12 robotic, 2 robotic, _ 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%((((((2c robotics) OR (29 robotics))) OR (21 robotics))) OR (((2 robotics) OR (22 robotic))))%((2c mechatronics) OR (etc mechatronics))%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%22control%((((((2c robotics) OR (29 robotics))) or (21 robotics))) or (((2 robotics) or (22 robotic))))%((2c mechatronics) or (etc mechatronics))%22".
• Adding a wildcard symbol may retrieve word variants: %22control%((((((2c robotics) OR (29 robotics))) or (21 robotics))) or (((2 robotics) or (22 robotic))))%((2c mechatronics) or (etc mechatronics))%22*.