Perhaps you should try some spelling variations:
defect engineering » electric engineering
theory engineering » therapy engineering, thermal engineering, energy engineering
heute engineering » route engineering, remote engineering, solute engineering

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: %((((defect engineering) OR (heat engineering))) OR (((heute engineering) OR (theory engineering))))%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%((((defect engineering) OR (heat engineering))) or (((heute engineering) or (theory engineering))))%22".
• Adding a wildcard symbol may retrieve word variants: %((((defect engineering) OR (heat engineering))) or (((heute engineering) or (theory engineering))))%22*.