Perhaps you should try some spelling variations:
22quality control » quality control, byquality control, forquality control
_quality control » quality control, byquality control, qouality control
quality controls » quality control, qualite controle, quality concepts
2 reliability » 3 reliability, 5 reliability
2c safety » 22 safety, 23 safety, 25 safety
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: %((22quality control) OR (((_quality control) OR (quality controls))))%2 reliability%((((2c safety) OR (5 safety))) OR (((2 safety) OR (_ safety)))) AND risk%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%((22quality control) or (((_quality control) or (quality controls))))%2 reliability%((((2c safety) or (5 safety))) or (((2 safety) OR (_ safety)))) and risk%22".
• Adding a wildcard symbol may retrieve word variants: %((22quality control) or (((_quality control) or (quality controls))))%2 reliability%((((2c safety) or (5 safety))) or (((2 safety) OR (_ safety)))) and risk%22*.