Perhaps you should try some spelling variations:
_quality control » byquality control, quality controls, qouality control
2c reliability » 2 reliability, 20 reliability, 21 reliability
24 reliability » 2.4 reliability, 2 reliability, 4 reliability
ic reliability » 2 reliability, 5 reliability, 9 reliability
2 safety » a 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: %((_quality control) OR (quality control))%((((2c reliability) OR (24 reliability))) OR (ic reliability))%((2 safety) OR (_ 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 (24 reliability))) or (ic reliability))%((2 safety) OR (_ safety)) and risk%22".
• Adding a wildcard symbol may retrieve word variants: %((_quality control) or (quality control))%((((2c reliability) or (24 reliability))) or (ic reliability))%((2 safety) OR (_ safety)) and risk%22*.