Perhaps you should try some spelling variations:
22quality control » quality control, _quality control, byquality control
2c reliability » 2 reliability, 24 reliability, ic reliability
21 reliability » 2 reliability, 1 reliability, 11 reliability
2c safety » 22 safety, 23 safety, 25 safety
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%((2c reliability) OR (21 reliability))%((2c safety) OR (2 safety)) AND risk%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%22quality control%((2c reliability) or (21 reliability))%((2c safety) OR (2 safety)) and risk%22".
• Adding a wildcard symbol may retrieve word variants: %22quality control%((2c reliability) or (21 reliability))%((2c safety) OR (2 safety)) and risk%22*.