Perhaps you should try some spelling variations:
_ optomechatronics » _ optomechatronic, _ biomechatronics, _ optomechanics
etc mechatronics » c mechatronics, data mechatronics, opto mechatronics
2c mechatronics » c mechatronics, _ mechatronics, 1 mechatronics
2c robotics » 2 robotics, 21 robotics, 29 robotics
26 robotics » 6 robotics, 2 robotics, 26 robotic
2 robotic » 12 robotic, _ robotic, 3 robotic

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 robotic))) OR (26 robotics))%((2c mechatronics) OR (((etc mechatronics) OR (_ optomechatronics))))%22.
• Adding a wildcard symbol may retrieve word variants: %22control%((((2c robotics) or (2 robotic))) or (26 robotics))%((2c mechatronics) or (((etc mechatronics) or (_ optomechatronics))))%22*.