Perhaps you should try some spelling variations:
22quality control » quality control, _quality control, byquality control
quality controls » quality control, qualite controle, quality concepts
2 reliability » 3 reliability, 5 reliability
23 safety » 2 safety, 13 safety, 22 safety
3 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 (quality controls))%2 reliability%((23 safety) OR (3 safety)) AND risk%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%((22quality control) or (quality controls))%2 reliability%((23 safety) OR (3 safety)) and risk%22".
• Adding a wildcard symbol may retrieve word variants: %((22quality control) or (quality controls))%2 reliability%((23 safety) OR (3 safety)) and risk%22*.