Perhaps you should try some spelling variations:
_quality control » byquality control, quality controls, qouality control
5 reliability » 3 reliability
2 reliability » 3 reliability
22 safety » 2 safety, 12 safety, _ safety
3 safety » _ safety, 5 safety, 4 safety
a safety » _ safety, a safe

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: %((quality control) OR (_quality control))%((5 reliability) OR (2 reliability))%((22 safety) OR (((3 safety) OR (a safety)))) AND risk%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%((quality control) or (_quality control))%((5 reliability) or (2 reliability))%((22 safety) or (((3 safety) OR (a safety)))) and risk%22".
• Adding a wildcard symbol may retrieve word variants: %((quality control) or (_quality control))%((5 reliability) or (2 reliability))%((22 safety) or (((3 safety) OR (a safety)))) and risk%22*.