Perhaps you should try some spelling variations:
_quality control » quality control, byquality control, quality controls
2c reliability » 2 reliability, 24 reliability, ic reliability
9 reliability » 3 reliability, 2 reliability, 5 reliability
2 safety » _ safety, 5 safety, 4 safety
a safety » _ 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 (9 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 (9 reliability))%((2 safety) OR (a safety)) and risk%22".
• Adding a wildcard symbol may retrieve word variants: %_quality control%((2c reliability) or (9 reliability))%((2 safety) OR (a safety)) and risk%22*.