Perhaps you should try some spelling variations:
2c mechatronics » c mechatronics, etc mechatronics, _ mechatronics
2c robotics » 2 robotics, 21 robotics, c robotics
29 robotics » 2 robotics, 19 robotics, 21 robotics
26 robotics » 6 robotics, 2 robotics, 26 robotic
9 robotics » _ robotics, a robotics, 6 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 (((29 robotics) OR (9 robotics))))) OR (26 robotics))%2c mechatronics%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%22control%((((2c robotics) or (((29 robotics) OR (9 robotics))))) or (26 robotics))%2c mechatronics%22".
• Adding a wildcard symbol may retrieve word variants: %22control%((((2c robotics) or (((29 robotics) OR (9 robotics))))) or (26 robotics))%2c mechatronics%22*.