Perhaps you should try some spelling variations:
2c reliability » 24 reliability, 20 reliability, 21 reliability
ic reliability » 5 reliability, 9 reliability, 8 reliability
2 reliability » 3 reliability, 5 reliability
2 safety » a safety, 5 safety, 4 safety

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))) OR (2 reliability))%((2 safety) OR (_ safety)) AND risk%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%quality control%((((2c reliability) or (ic reliability))) or (2 reliability))%((2 safety) OR (_ safety)) and risk%22".
• Adding a wildcard symbol may retrieve word variants: %quality control%((((2c reliability) or (ic reliability))) or (2 reliability))%((2 safety) OR (_ safety)) and risk%22*.