Perhaps you should try some spelling variations:
byquality control » quality control, _quality control, forquality control
5 reliability » 3 reliability
2 reliability » 3 reliability
22 safety » 2 safety, _ safety, 5 safety
12 safety » 2 safety, 10 safety, 11 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: %byquality control%((5 reliability) OR (2 reliability))%((((22 safety) OR (12 safety))) OR (a safety)) AND risk%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%byquality control%((5 reliability) or (2 reliability))%((((22 safety) OR (12 safety))) or (a safety)) and risk%22".
• Adding a wildcard symbol may retrieve word variants: %byquality control%((5 reliability) or (2 reliability))%((((22 safety) OR (12 safety))) or (a safety)) and risk%22*.