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, 23 safety, 25 safety
22 safety » 2 safety, 12 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%((24 reliability) OR (ic reliability))%((((2c safety) OR (22 safety))) OR (5 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 (22 safety))) or (5 safety)) and risk%22".
• Adding a wildcard symbol may retrieve word variants: %quality control%((24 reliability) or (ic reliability))%((((2c safety) OR (22 safety))) or (5 safety)) and risk%22*.