Perhaps you should try some spelling variations:
22quality control » quality control, byquality control, forquality control
_quality control » quality control, byquality control, quality controls
21 reliability » 1 reliability, 11 reliability, 20 reliability
ic reliability » 5 reliability, 7 reliability, 8 reliability
2 reliability » 3 reliability, 5 reliability
12 safety » 2 safety, 10 safety, 1 safety
11 safety » 10 safety, 5 safety, 4 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))%((((21 reliability) OR (2 reliability))) OR (ic reliability))%((((12 safety) OR (11 safety))) OR (((2((a safety) OR (_ safety))) OR (((a safety) OR (_ safety)))))) AND risk%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%((22quality control) OR (_quality control))%((((21 reliability) or (2 reliability))) or (ic reliability))%((((12 safety) or (11 safety))) or (((2((a safety) or (_ safety))) or (((a safety) or (_ safety)))))) and risk%22".
• Adding a wildcard symbol may retrieve word variants: %((22quality control) OR (_quality control))%((((21 reliability) or (2 reliability))) or (ic reliability))%((((12 safety) or (11 safety))) or (((2((a safety) or (_ safety))) or (((a safety) or (_ safety)))))) and risk%22*.