Perhaps you should try some spelling variations:
_quality control » byquality control, quality controls, qouality control
ic reliability » 5 reliability, 2 reliability, 7 reliability
4 reliability » 3 reliability, 5 reliability, 2 reliability
2 safety » 5 safety, 3 safety
4 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))%((4 reliability) OR (ic reliability))%((2 safety) OR (4 safety)) AND risk%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%((_quality control) OR (quality control))%((4 reliability) or (ic reliability))%((2 safety) or (4 safety)) and risk%22".
• Adding a wildcard symbol may retrieve word variants: %((_quality control) OR (quality control))%((4 reliability) or (ic reliability))%((2 safety) or (4 safety)) and risk%22*.