Perhaps you should try some spelling variations:
_quality control » byquality control, quality controls, qouality control
11 reliability » 1 reliability, 3 reliability, 5 reliability
2 reliability » 3 reliability, 5 reliability
12 safety » 10 safety, 11 safety, 1 safety
2 safety » _ safety, a safety, 5 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))%((11 reliability) OR (2 reliability))%((12 safety) OR (2 safety)) AND risk%22.
• Adding a wildcard symbol may retrieve word variants: %((_quality control) or (quality control))%((11 reliability) or (2 reliability))%((12 safety) or (2 safety)) and risk%22*.