Perhaps you should try some spelling variations:
22quality control » _quality control, byquality control, forquality control
2c reliability » 2 reliability, 20 reliability, 24 reliability
2c safety » 2 safety, 23 safety, 25 safety
22 safety » 2 safety, 12 safety, 5 safety
safety » samety
safe » same

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 (22 safety))) OR (((_ safety) OR (a safe)))) 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 (22 safety))) or (((_ safety) or (a safe)))) and risk%22".
• Adding a wildcard symbol may retrieve word variants: %((22quality control) OR (quality control))%2c reliability%((((2c safety) or (22 safety))) or (((_ safety) or (a safe)))) and risk%22*.