Perhaps you should try some spelling variations:
22quality control » quality control, _quality control, byquality control
2c reliability » 2 reliability, 24 reliability, ic reliability
5 reliability » 3 reliability, 2 reliability
2c safety » 23 safety, 25 safety, 21 safety
22 safety » 12 safety, _ safety, 5 safety
a safety » _ safety, a safe
2 safety » _ safety, 5 safety, 4 safety

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 (5 reliability))%((2c safety) OR (((((22 safety) OR (a 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 (5 reliability))%((2c safety) or (((((22 safety) OR (a safety))) or (2 safety)))) and risk%22".
• Adding a wildcard symbol may retrieve word variants: %22quality control%((2c reliability) or (5 reliability))%((2c safety) or (((((22 safety) OR (a safety))) or (2 safety)))) and risk%22*.