Perhaps you should try some spelling variations:
etc mechatronics » c mechatronics, data mechatronics, opto mechatronics
2c robotics » 2 robotics, 21 robotics, 29 robotics
26 robotics » 2 robotics, 26 robotic, 16 robotics
6 robotics » _ robotics, 6 robotic, a robotics

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