Perhaps you should try some spelling variations:
_quality control » byquality control, quality controls, qouality control
2 reliability » 3 reliability
5 reliability » 3 reliability
9 reliability » 3 reliability, 4 reliability
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: %((_quality control) OR (quality control))%((((2 reliability) OR (5 reliability))) OR (9 reliability))%((23 safety) OR (5 safety)) AND risk%22.
• Adding a wildcard symbol may retrieve word variants: %((_quality control) or (quality control))%((((2 reliability) or (5 reliability))) or (9 reliability))%((23 safety) or (5 safety)) and risk%22*.