Perhaps you should try some spelling variations:
22quality control » quality control, byquality control, forquality control
_quality control » quality control, byquality control, quality controls
2c reliability » 2 reliability, 24 reliability, 20 reliability
ic reliability » 2 reliability, 5 reliability, 9 reliability
2 safety » _ safety, a safety, 4 safety
5 safety » _ safety, a 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))%((2c reliability) OR (ic reliability))%((((2 safety) OR (5 safety))) OR (2((2 safety) OR (5 safety)))) AND risk%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%((22quality control) OR (_quality control))%((2c reliability) or (ic reliability))%((((2 safety) or (5 safety))) or (2((2 safety) or (5 safety)))) and risk%22".
• Adding a wildcard symbol may retrieve word variants: %((22quality control) OR (_quality control))%((2c reliability) or (ic reliability))%((((2 safety) or (5 safety))) or (2((2 safety) or (5 safety)))) and risk%22*.