Perhaps you should try some spelling variations:
24 reliability » 2.4 reliability, 2 reliability, 4 reliability
ic reliability » 3 reliability, 5 reliability, 2 reliability
2c safety » 2 safety, 22 safety, 23 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%((24 reliability) OR (ic reliability))%((2c safety) OR (((5 safety) OR (a safety)))) AND risk%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%quality control%((24 reliability) or (ic reliability))%((2c safety) or (((5 safety) OR (a safety)))) and risk%22".
• Adding a wildcard symbol may retrieve word variants: %quality control%((24 reliability) or (ic reliability))%((2c safety) or (((5 safety) OR (a safety)))) and risk%22*.