Perhaps you should try some spelling variations:
2c reliability » 2 reliability, 20 reliability, 24 reliability
9 reliability » 3 reliability, 5 reliability, 2 reliability
22 safety » 5 safety, 4 safety, 3 safety
12 safety » 11 safety, 5 safety, 4 safety
10 safety » 5 safety, 4 safety, 3 safety
2 safety » 5 safety, 4 safety, 3 safety
1 safety » 11 safety, 5 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%((2c reliability) OR (9 reliability))%((((22 safety) OR (2 safety))) OR (((((12 safety) OR (1 safety))) OR (10 safety)))) AND risk%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%quality control%((2c reliability) or (9 reliability))%((((22 safety) OR (2 safety))) or (((((12 safety) or (1 safety))) or (10 safety)))) and risk%22".
• Adding a wildcard symbol may retrieve word variants: %quality control%((2c reliability) or (9 reliability))%((((22 safety) OR (2 safety))) or (((((12 safety) or (1 safety))) or (10 safety)))) and risk%22*.