Perhaps you should try some spelling variations:
2c reliability » 20 reliability, 24 reliability, 29 reliability
ic reliability » 3 reliability, 5 reliability, 7 reliability
2 reliability » 3 reliability, 5 reliability
2 safety » 5 safety, 4 safety, 3 safety
a safety » a safe

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) OR (2 reliability))))%((2 safety) OR (a 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 (a 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 (a safety)) and risk%22*.