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