Perhaps you should try some spelling variations:
2c reliability » 2 reliability, 24 reliability, 20 reliability
ic reliability » 2 reliability, 5 reliability, 9 reliability
2c safety » 22 safety, 23 safety, 25 safety
12 safety » 10 safety, 11 safety, 1 safety
2 safety » _ safety, a safety, 5 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 (ic reliability))%((((2c safety) OR (2 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 (ic reliability))%((((2c safety) OR (2 safety))) or (12 safety)) and risk%22".
• Adding a wildcard symbol may retrieve word variants: %quality control%((2c reliability) or (ic reliability))%((((2c safety) OR (2 safety))) or (12 safety)) and risk%22*.