Perhaps you should try some spelling variations:
22quality control » quality control, _quality control, byquality control
qouality control » quality control, quality controls, _quality control
9 reliability » 3 reliability, 2 reliability, 4 reliability
5 reliability » 3 reliability, 2 reliability
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 (qouality control))%((9 reliability) OR (5 reliability))%2 safety AND risk%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%((22quality control) or (qouality control))%((9 reliability) OR (5 reliability))%2 safety and risk%22".
• Adding a wildcard symbol may retrieve word variants: %((22quality control) or (qouality control))%((9 reliability) OR (5 reliability))%2 safety and risk%22*.