Perhaps you should try some spelling variations:
22quality control » quality control, _quality control, byquality control
2c reliability » 2 reliability, ic reliability, 20 reliability
2c safety » 23 safety, 25 safety, 21 safety
22 safety » 12 safety, a safety, 5 safety
2 safety » a safety, 5 safety, 4 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%((((2c safety) OR (2 safety))) OR (22 safety)) AND risk%22.
• Adding a wildcard symbol may retrieve word variants: %22quality control%2c reliability%((((2c safety) or (2 safety))) or (22 safety)) and risk%22*.