Perhaps you should try some spelling variations:
_quality control » quality control, byquality control, quality controls
2.4 reliability » 2.6 reliability, 5.4 reliability, 2.2 reliability
2c reliability » 2 reliability, 29 reliability, 21 reliability
20 reliability » 2 reliability, 10 reliability, 29 reliability
24 reliability » 2 reliability, 14 reliability, 29 reliability
ic reliability » 3 reliability, 5 reliability, 2 reliability
2c safety » 2 safety, 22 safety, 23 safety
3 safety » 4 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 (20 reliability))) OR (((24 reliability) OR (2.4 reliability))))) OR (ic reliability))%((2c safety) OR (((3 safety) OR (5 safety)))) AND risk%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%_quality control%((((((2c reliability) or (20 reliability))) or (((24 reliability) OR (2.4 reliability))))) or (ic reliability))%((2c safety) or (((3 safety) or (5 safety)))) and risk%22".
• Adding a wildcard symbol may retrieve word variants: %_quality control%((((((2c reliability) or (20 reliability))) or (((24 reliability) OR (2.4 reliability))))) or (ic reliability))%((2c safety) or (((3 safety) or (5 safety)))) and risk%22*.