Perhaps you should try some spelling variations:
_quality control » quality control, byquality control, quality controls
2c reliability » 2 reliability, 20 reliability, 24 reliability
ic reliability » 5 reliability, 2 reliability, 7 reliability
2 safety » 3 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 (ic reliability))%((((((((2 safety) OR (_ safety))) OR (a safety))) OR (5 safety))) OR (4 safety)) AND risk%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%_quality control%((2c reliability) or (ic reliability))%((((((((2 safety) OR (_ safety))) or (a safety))) or (5 safety))) or (4 safety)) and risk%22".
• Adding a wildcard symbol may retrieve word variants: %_quality control%((2c reliability) or (ic reliability))%((((((((2 safety) OR (_ safety))) or (a safety))) or (5 safety))) or (4 safety)) and risk%22*.