Perhaps you should try some spelling variations:
_quality control » quality control, byquality control, quality controls
2c reliability » 20 reliability, 24 reliability, ic reliability
21 reliability » 1 reliability, 11 reliability, 20 reliability
9 reliability » 4 reliability
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 (((((2 reliability) OR (3 reliability))) OR (5 reliability))))) OR (21 reliability))) OR (9 reliability))%2 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 (3 reliability))) or (5 reliability))))) or (21 reliability))) or (9 reliability))%2 safety and risk%22".
• Adding a wildcard symbol may retrieve word variants: %_quality control%((((((2c reliability) or (((((2 reliability) OR (3 reliability))) or (5 reliability))))) or (21 reliability))) or (9 reliability))%2 safety and risk%22*.