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