Perhaps you should try some spelling variations:
22quality control » quality control, _quality control, byquality control
24 reliability » 2.4 reliability, 2 reliability, 4 reliability
ic reliability » 3 reliability, 5 reliability, 2 reliability
2c safety » 22 safety, 21 safety, 24 safety
25 safety » 5 safety, 15 safety, 22 safety
23 safety » 3 safety, 13 safety, 22 safety
2 safety » 5 safety, 4 safety, 3 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%((24 reliability) OR (ic reliability))%((((2c safety) OR (25 safety))) OR (((23 safety) OR (2 safety)))) AND risk%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%22quality control%((24 reliability) or (ic reliability))%((((2c safety) OR (25 safety))) or (((23 safety) or (2 safety)))) and risk%22".
• Adding a wildcard symbol may retrieve word variants: %22quality control%((24 reliability) or (ic reliability))%((((2c safety) OR (25 safety))) or (((23 safety) or (2 safety)))) and risk%22*.