Perhaps you should try some spelling variations:
_quality control » byquality control, quality controls, qouality control
2c reliability » 2 reliability, 20 reliability, 24 reliability
ic reliability » 5 reliability, 2 reliability, 7 reliability
22 safety » 2 safety, 12 safety, 4 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) OR (quality control))%((2c reliability) OR (ic reliability))%((((22 safety) OR (_ safety))) OR (((a safety) OR (5 safety)))) AND risk%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%((_quality control) or (quality control))%((2c reliability) or (ic reliability))%((((22 safety) OR (_ safety))) or (((a safety) or (5 safety)))) and risk%22".
• Adding a wildcard symbol may retrieve word variants: %((_quality control) or (quality control))%((2c reliability) or (ic reliability))%((((22 safety) OR (_ safety))) or (((a safety) or (5 safety)))) and risk%22*.