Perhaps you should try some spelling variations:
etc mechatronics » c mechatronics, data mechatronics, opto mechatronics
2c mechatronics » c mechatronics, _ mechatronics, 1 mechatronics
2c robotics » 2 robotics, 21 robotics, 26 robotics
26 robotic » 2 robotic, 22 robotic, 16 robotic
6 robotic » _ robotic, 3 robotic, 6 robot

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 (((26 robotic) OR (6 robotic))))%((2c mechatronics) OR (etc mechatronics))%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%22control%((2c robotics) or (((26 robotic) OR (6 robotic))))%((2c mechatronics) or (etc mechatronics))%22".
• Adding a wildcard symbol may retrieve word variants: %22control%((2c robotics) or (((26 robotic) OR (6 robotic))))%((2c mechatronics) or (etc mechatronics))%22*.