Perhaps you should try some spelling variations:
_quality control » quality control, byquality control, quality controls
2c reliability » 20 reliability, 24 reliability, 29 reliability
ic reliability » 7 reliability, 8 reliability, 11 reliability
2 reliability » 3 reliability
5 reliability » 3 reliability
22 safety » 2 safety, 12 safety, 5 safety
2a safety » 2 safety, 23 safety, 25 safety
15 safety » 5 safety, 10 safety, 11 safety
a 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: %_quality control%((((2c reliability) OR (((2 reliability) OR (5 reliability))))) OR (ic reliability))%((22 safety) OR (((((2a safety) OR (15 safety))) OR (a safety)))) AND risk%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%_quality control%((((2c reliability) or (((2 reliability) OR (5 reliability))))) or (ic reliability))%((22 safety) or (((((2a safety) or (15 safety))) or (a safety)))) and risk%22".
• Adding a wildcard symbol may retrieve word variants: %_quality control%((((2c reliability) or (((2 reliability) OR (5 reliability))))) or (ic reliability))%((22 safety) or (((((2a safety) or (15 safety))) or (a safety)))) and risk%22*.