Perhaps you should try some spelling variations:
22quality control » quality control, _quality control, byquality control
2 reliability » 3 reliability, 5 reliability
9 reliability » 3 reliability, 5 reliability, 4 reliability
22 safety » 2 safety, a safety, 5 safety
12 safety » 2 safety, 10 safety, 11 safety
23 safety » 3 safety, 2 safety, 13 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: %22quality control%((2 reliability) OR (9 reliability))%((((22 safety) OR (12 safety))) OR (((23 safety) OR (_ safety)))) AND risk%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%22quality control%((2 reliability) or (9 reliability))%((((22 safety) OR (12 safety))) or (((23 safety) or (_ safety)))) and risk%22".
• Adding a wildcard symbol may retrieve word variants: %22quality control%((2 reliability) or (9 reliability))%((((22 safety) OR (12 safety))) or (((23 safety) or (_ safety)))) and risk%22*.