Perhaps you should try some spelling variations:
etc mechatronics » data mechatronics, opto mechatronics, _ mechatronics
c mechatronics » _ mechatronics, 1 mechatronics, a mechatronics
2c robotics » 2 robotics, 21 robotics, c robotics
29 robotics » 2 robotics, 9 robotics, 19 robotics
26 robotics » 6 robotics, 2 robotics, 26 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 (29 robotics))) OR (26 robotics))%((etc mechatronics) OR (c mechatronics))%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%22control%((((2c robotics) or (29 robotics))) or (26 robotics))%((etc mechatronics) OR (c mechatronics))%22".
• Adding a wildcard symbol may retrieve word variants: %22control%((((2c robotics) or (29 robotics))) or (26 robotics))%((etc mechatronics) OR (c mechatronics))%22*.