Perhaps you should try some spelling variations:
22quality control » byquality control, forquality control, quality controls
_quality control » byquality control, quality controls, qouality control
29 reliability » 2 reliability, 9 reliability, 20 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))) OR (_quality control))%29 reliability%a safety AND risk%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%((((22quality control) OR (quality control))) or (_quality control))%29 reliability%a safety and risk%22".
• Adding a wildcard symbol may retrieve word variants: %((((22quality control) OR (quality control))) or (_quality control))%29 reliability%a safety and risk%22*.