Perhaps you should try some spelling variations:
22quality control » quality control, _quality control, byquality control
21 reliability » 1 reliability, 24 reliability, 29 reliability
11 reliability » 1 reliability, 3 reliability, 5 reliability
ic reliability » 5 reliability, 9 reliability, 8 reliability
2 reliability » 3 reliability, 5 reliability
22 safety » 2 safety, 12 safety, _ safety
2a safety » 2 safety, 23 safety, 25 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%((((((21 reliability) OR (11 reliability))) OR (2 reliability))) OR (ic reliability))%((22 safety) OR (((2a safety) OR (a safety)))) AND risk%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%22quality control%((((((21 reliability) OR (11 reliability))) or (2 reliability))) or (ic reliability))%((22 safety) or (((2a safety) or (a safety)))) and risk%22".
• Adding a wildcard symbol may retrieve word variants: %22quality control%((((((21 reliability) OR (11 reliability))) or (2 reliability))) or (ic reliability))%((22 safety) or (((2a safety) or (a safety)))) and risk%22*.