Perhaps you should try some spelling variations:
2c reliability » 2 reliability, 20 reliability, 24 reliability
7 reliability » 3 reliability, 2 reliability, 4 reliability
5 reliability » 3 reliability
2c safety » 22 safety, 23 safety, 25 safety
12 safety » 10 safety, 11 safety, 1 safety
2 safety » 5 safety, 4 safety, 3 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 (((7 reliability) OR (5 reliability))))%((2c safety) OR (((12 safety) OR (2 safety)))) AND risk%22.
• Adding a wildcard symbol may retrieve word variants: %quality control%((2c reliability) or (((7 reliability) or (5 reliability))))%((2c safety) or (((12 safety) or (2 safety)))) and risk%22*.