Perhaps you should try some spelling variations:
2c mechatronics » c mechatronics, etc mechatronics, _ mechatronics
2c robotics » 2 robotics, 29 robotics, c robotics
21 robotics » 2.1 robotics, 1 robotics, 11 robotics
12 robotics » 1 robotics, 11 robotics, 2 robotics
26 robotics » 6 robotics, 2 robotics, 26 robotic
12 robotic » 11 robotic, 2 robotic, _ 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 (21 robotics))) OR (((12 robotics) OR (12 robotic))))) OR (26 robotics))%2c mechatronics%22.
• Adding a wildcard symbol may retrieve word variants: %22control%((((((2c robotics) or (21 robotics))) or (((12 robotics) or (12 robotic))))) or (26 robotics))%2c mechatronics%22*.