Perhaps you should try some spelling variations:
22quality control » quality control, _quality control, byquality control
20 reliability » 2 reliability, 10 reliability, 24 reliability
ic reliability » 5 reliability, 2 reliability, 7 reliability
22 safety » 12 safety, 4 safety, 3 safety
23 safety » 3 safety, 13 safety, 4 safety
2 safety » 4 safety, 3 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%((20 reliability) OR (ic reliability))%((22 safety) OR (((23 safety) OR (((2 safety) OR (5 safety)))))) AND risk%22.
• Adding a wildcard symbol may retrieve word variants: %22quality control%((20 reliability) or (ic reliability))%((22 safety) or (((23 safety) or (((2 safety) or (5 safety)))))) and risk%22*.