Perhaps you should try some spelling variations:
2c reliability » 2 reliability, 24 reliability, 21 reliability
20 reliability » 2 reliability, 10 reliability, 24 reliability
ic reliability » 2 reliability, 5 reliability, 9 reliability
22 safety » 2 safety, _ safety, a safety
12 safety » 2 safety, 10 safety, 11 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%((((2c reliability) OR (20 reliability))) OR (ic reliability))%((22 safety) OR (12 safety)) AND risk%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%quality control%((((2c reliability) OR (20 reliability))) or (ic reliability))%((22 safety) or (12 safety)) and risk%22".
• Adding a wildcard symbol may retrieve word variants: %quality control%((((2c reliability) OR (20 reliability))) or (ic reliability))%((22 safety) or (12 safety)) and risk%22*.