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, ic reliability
5 reliability » 2 reliability
25 safety » 5 safety, 15 safety, 22 safety
3 safety » _ safety, a safety, 5 safety
2 safety » _ safety, a 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))%((((2c reliability) OR (3 reliability))) OR (5 reliability))%((25 safety) OR (((3 safety) OR (2 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 (3 reliability))) or (5 reliability))%((25 safety) or (((3 safety) or (2 safety)))) and risk%22".
• Adding a wildcard symbol may retrieve word variants: %((22quality control) OR (_quality control))%((((2c reliability) or (3 reliability))) or (5 reliability))%((25 safety) or (((3 safety) or (2 safety)))) and risk%22*.