Perhaps you should try some spelling variations:
_quality control » byquality control, quality controls, qouality control
29 reliability » 2 reliability, 9 reliability, 24 reliability
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))%29 reliability%((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))%29 reliability%((3 safety) OR (a safety)) and risk%22".
• Adding a wildcard symbol may retrieve word variants: %((quality control) or (_quality control))%29 reliability%((3 safety) OR (a safety)) and risk%22*.