Perhaps you should try some spelling variations:
_quality control » quality control, byquality control, quality controls
2c reliability » 2 reliability, 24 reliability, 20 reliability
ic reliability » 2 reliability, 5 reliability, 9 reliability
2 safety » a safety, 4 safety, 3 safety
5 safety » a safety

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: %_quality control%((2c reliability) OR (ic reliability))%((2 safety) OR (((5 safety) OR (_ safety)))) AND risk%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%_quality control%((2c reliability) or (ic reliability))%((2 safety) or (((5 safety) OR (_ safety)))) and risk%22".
• Adding a wildcard symbol may retrieve word variants: %_quality control%((2c reliability) or (ic reliability))%((2 safety) or (((5 safety) OR (_ safety)))) and risk%22*.