Perhaps you should try some spelling variations:
2c reliability » 20 reliability, 24 reliability, 29 reliability
ic reliability » 7 reliability, 8 reliability, 11 reliability
2c safety » 2 safety, 22 safety, 23 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 (2 reliability))) OR (((((ic reliability) OR (3 reliability))) OR (5 reliability))))%((2c 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 (2 reliability))) or (((((ic reliability) or (3 reliability))) or (5 reliability))))%((2c safety) or (12 safety)) and risk%22".
• Adding a wildcard symbol may retrieve word variants: %quality control%((((2c reliability) OR (2 reliability))) or (((((ic reliability) or (3 reliability))) or (5 reliability))))%((2c safety) or (12 safety)) and risk%22*.