Perhaps you should try some spelling variations:
und raumfahrttechnik » und radartechnik
und raumlufttechnik » 1 raumlufttechnik, 7 raumlufttechnik
luft- » left-
raumlufttechnik » raumlefttechnik

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: luft- ((und raumfahrttechnik) OR (und raumlufttechnik)).
• Adding a wildcard symbol may retrieve word variants: luft- ((und raumfahrttechnik) or (und raumlufttechnik))*.