Perhaps you should try some spelling variations:
etc mechatronics » c mechatronics, data mechatronics, opto mechatronics
11 mechatronics » 1 mechatronics, a mechatronics, 11 mechanics
_ mechatronics » _ mechanics
2 robotics » _ robotics, a robotics, 2 robotic
26 robotic » 2 robotic, 22 robotic, 16 robotic
6 robotic » _ robotic, 3 robotic, 6 robot

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%((2 robotics) OR (((26 robotic) OR (6 robotic))))%((((11 mechatronics) OR (etc mechatronics))) OR (_ mechatronics))%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%22control%((2 robotics) or (((26 robotic) OR (6 robotic))))%((((11 mechatronics) or (etc mechatronics))) or (_ mechatronics))%22".
• Adding a wildcard symbol may retrieve word variants: %22control%((2 robotics) or (((26 robotic) OR (6 robotic))))%((((11 mechatronics) or (etc mechatronics))) or (_ mechatronics))%22*.