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
23 safety » 13 safety, 22 safety, 5 safety
2 safety » 5 safety
4 safety » 5 safety
3 safety » 5 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: %_quality control%((2c reliability) OR (ic reliability))%((((((2 safety) OR (4 safety))) OR (((23 safety) OR (_ safety))))) OR (3 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 (4 safety))) or (((23 safety) or (_ safety))))) or (3 safety)) and risk%22*".