Perhaps you should try some spelling variations:
22quality control » _quality control, byquality control, forquality control
2c reliability » 2 reliability, ic reliability, 20 reliability
2c safety » 2 safety, 23 safety, 25 safety
21 safety » 2 safety, 11 safety, 1 safety
22 safety » 2 safety, 12 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%((((2c safety) OR (21 safety))) OR (22 safety)) AND risk%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%((22quality control) OR (quality control))%2c reliability%((((2c safety) or (21 safety))) or (22 safety)) and risk%22".
• Adding a wildcard symbol may retrieve word variants: %((22quality control) OR (quality control))%2c reliability%((((2c safety) or (21 safety))) or (22 safety)) and risk%22*.