Perhaps you should try some spelling variations:
22quality control » quality control, _quality control, byquality control
ic reliability » 5 reliability, 9 reliability, 8 reliability
2 reliability » 3 reliability, 5 reliability
23 safety » 3 safety, 13 safety, 22 safety
2 safety » _ safety, 5 safety, 4 safety
a safety » _ safety, a safe

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 (ic reliability))%((((2 safety) OR (a safety))) OR (23 safety)) AND risk%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%22quality control%((2 reliability) or (ic reliability))%((((2 safety) OR (a safety))) or (23 safety)) and risk%22".
• Adding a wildcard symbol may retrieve word variants: %22quality control%((2 reliability) or (ic reliability))%((((2 safety) OR (a safety))) or (23 safety)) and risk%22*.