Perhaps you should try some spelling variations:
_quality control » quality control, byquality control, quality controls
29 reliability » 2 reliability, 9 reliability, 20 reliability
24 reliability » 2.4 reliability, 2 reliability, 4 reliability
ic reliability » 5 reliability, 2 reliability, 7 reliability
2 safety » 4 safety, 3 safety

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%((((29 reliability) OR (24 reliability))) OR (ic reliability))%((2 safety) OR (((5 safety) OR (_ safety)))) AND risk%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%_quality control%((((29 reliability) or (24 reliability))) or (ic reliability))%((2 safety) or (((5 safety) OR (_ safety)))) and risk%22".
• Adding a wildcard symbol may retrieve word variants: %_quality control%((((29 reliability) or (24 reliability))) or (ic reliability))%((2 safety) or (((5 safety) OR (_ safety)))) and risk%22*.