Perhaps you should try some spelling variations:
_quality control » quality control, byquality control, quality controls
24 reliability » 2.4 reliability, 2 reliability, 4 reliability
ic reliability » 5 reliability, 2 reliability, 7 reliability
2 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%((24 reliability) OR (ic reliability))%((((2 safety) OR (5 safety))) OR (4 safety)) AND risk%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%_quality control%((24 reliability) or (ic reliability))%((((2 safety) OR (5 safety))) or (4 safety)) and risk%22".
• Adding a wildcard symbol may retrieve word variants: %_quality control%((24 reliability) or (ic reliability))%((((2 safety) OR (5 safety))) or (4 safety)) and risk%22*.