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