Perhaps you should try some spelling variations:
22quality control » quality control, _quality control, byquality control
2c reliability » 2 reliability, 24 reliability, ic reliability
9 reliability » 3 reliability, 2 reliability, 5 reliability
2c safety » 25 safety, 21 safety, 24 safety
22 safety » 12 safety, _ safety, a safety
23 safety » 13 safety, _ safety, a safety
3 safety » _ safety, a safety, 5 safety
2 safety » _ safety, a safety, 5 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%((2c reliability) OR (9 reliability))%((((2c safety) OR (22 safety))) OR (((((23 safety) OR (3 safety))) OR (2 safety)))) AND risk%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%22quality control%((2c reliability) or (9 reliability))%((((2c safety) OR (22 safety))) or (((((23 safety) or (3 safety))) or (2 safety)))) and risk%22".
• Adding a wildcard symbol may retrieve word variants: %22quality control%((2c reliability) or (9 reliability))%((((2c safety) OR (22 safety))) or (((((23 safety) or (3 safety))) or (2 safety)))) and risk%22*.