Perhaps you should try some spelling variations:
22quality control » byquality control, forquality control, quality controls
_quality control » byquality control, quality controls, qouality control
10 reliability » 3 reliability, 2 reliability, 4 reliability
ic reliability » 2 reliability, 7 reliability, 8 reliability
5 reliability » 3 reliability
22 safety » 12 safety, 5 safety, 4 safety
2a safety » 23 safety, 25 safety, 21 safety
2 safety » 5 safety, 4 safety, 3 safety
a safety » a safe

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: %((((22quality control) OR (quality control))) OR (_quality control))%((((10 reliability) OR (5 reliability))) OR (ic reliability))%((((22 safety) OR (2 safety))) OR (((2a safety) OR (a safety)))) AND risk%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%((((22quality control) OR (quality control))) or (_quality control))%((((10 reliability) or (5 reliability))) or (ic reliability))%((((22 safety) or (2 safety))) or (((2a safety) or (a safety)))) and risk%22".
• Adding a wildcard symbol may retrieve word variants: %((((22quality control) OR (quality control))) or (_quality control))%((((10 reliability) or (5 reliability))) or (ic reliability))%((((22 safety) or (2 safety))) or (((2a safety) or (a safety)))) and risk%22*.