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