Perhaps you should try some spelling variations:
22quality control » quality control, _quality control, byquality control
4 reliability » 3 reliability, 2 reliability
5 reliability » 3 reliability, 2 reliability
2c safety » 2 safety, 22 safety, 23 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%((4 reliability) OR (5 reliability))%2c safety AND risk%22.
• Adding a wildcard symbol may retrieve word variants: %22quality control%((4 reliability) or (5 reliability))%2c safety and risk%22*.