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

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