Perhaps you should try some spelling variations:
22quality control » quality control, byquality control, forquality control
_quality control » quality control, byquality control, quality controls
24 reliability » 2.4 reliability, 2 reliability, 4 reliability
21 reliability » 2 reliability, 1 reliability, 11 reliability
ic reliability » 5 reliability, 2 reliability, 7 reliability
2c safety » 23 safety, 25 safety, 21 safety
22 safety » 12 safety, 5 safety, 4 safety
2 safety » 5 safety, 4 safety, 3 safety

Try widening your search to All Fields.

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) OR (_quality control))%((((24 reliability) OR (21 reliability))) OR (ic reliability))%((((2c safety) OR (2 safety))) OR (((22 safety) OR (_ safety)))) AND risk%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%((22quality control) or (_quality control))%((((24 reliability) or (21 reliability))) or (ic reliability))%((((2c safety) OR (2 safety))) or (((22 safety) or (_ safety)))) and risk%22".
• Adding a wildcard symbol may retrieve word variants: %((22quality control) or (_quality control))%((((24 reliability) or (21 reliability))) or (ic reliability))%((((2c safety) OR (2 safety))) or (((22 safety) or (_ safety)))) and risk%22*.