Perhaps you should try some spelling variations:
22quality control » _quality control, byquality control, forquality control
29 reliability » 2 reliability, 9 reliability, 20 reliability
24 reliability » 2.4 reliability, 2 reliability, 4 reliability
22 safety » 2 safety, 12 safety, 5 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))%((29 reliability) OR (24 reliability))%22 safety AND risk%22.
• Adding a wildcard symbol may retrieve word variants: %((22quality control) or (quality control))%((29 reliability) or (24 reliability))%22 safety and risk%22*.