Perhaps you should try some spelling variations:
etc mechatronics » c mechatronics, data mechatronics, opto mechatronics
2c mechatronics » c mechatronics, _ mechatronics, 1 mechatronics
2c robotics » 21 robotics, 29 robotics, c robotics
26 robotics » 6 robotics, 26 robotic, 16 robotics
2 robotics » _ robotics, a robotics, 2 robotic

Try widening your search to All Fields.

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