Perhaps you should try some spelling variations:
_quality control » quality control, byquality control, quality controls
2c reliability » 2 reliability, 20 reliability, 24 reliability
5 reliability » 3 reliability
22 safety » 2 safety, 12 safety, 5 safety
3 safety » 5 safety, 4 safety
a safety » a safe

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: %_quality control%((2c reliability) OR (5 reliability))%((22 safety) OR (((3 safety) OR (a safety)))) AND risk%22.
• Adding a wildcard symbol may retrieve word variants: %_quality control%((2c reliability) or (5 reliability))%((22 safety) or (((3 safety) or (a safety)))) and risk%22*.