Perhaps you should try some spelling variations:
22quality control » quality control, _quality control, byquality control
2.4 reliability » 2.6 reliability, 5.4 reliability, 2.2 reliability
ic reliability » 3 reliability, 5 reliability, 2 reliability
2c safety » 2 safety, 25 safety, 21 safety
22 safety » 2 safety, 12 safety, 5 safety
23 safety » 3 safety, 2 safety, 13 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%((2.4 reliability) OR (ic reliability))%((((2c safety) OR (22 safety))) OR (23 safety)) AND risk%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%22quality control%((2.4 reliability) or (ic reliability))%((((2c safety) OR (22 safety))) or (23 safety)) and risk%22".
• Adding a wildcard symbol may retrieve word variants: %22quality control%((2.4 reliability) or (ic reliability))%((((2c safety) OR (22 safety))) or (23 safety)) and risk%22*.