Perhaps you should try some spelling variations:
22quality control » quality control, _quality control, byquality control
10 reliability » 3 reliability, 5 reliability, 4 reliability
2 reliability » 3 reliability, 5 reliability
25 safety » 5 safety, 2 safety, 15 safety
23 safety » 3 safety, 2 safety, 13 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%((10 reliability) OR (2 reliability))%((25 safety) OR (23 safety)) AND risk%22.
• Adding a wildcard symbol may retrieve word variants: %22quality control%((10 reliability) or (2 reliability))%((25 safety) or (23 safety)) and risk%22*.