Perhaps you should try some spelling variations:
_quality control » quality control, byquality control, quality controls
2c reliability » 2 reliability, 24 reliability, ic reliability
2c safety » 23 safety, 25 safety, 21 safety
22 safety » 12 safety, _ safety, a safety
2 safety » _ safety, a safety, 5 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%((((2c safety) OR (2 safety))) OR (22 safety)) AND risk%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%_quality control%2c reliability%((((2c safety) OR (2 safety))) or (22 safety)) and risk%22".
• Adding a wildcard symbol may retrieve word variants: %_quality control%2c reliability%((((2c safety) OR (2 safety))) or (22 safety)) and risk%22*.