Perhaps you should try some spelling variations:
22quality control » quality control, forquality control, qouality control
byquality control » quality control, forquality control, qouality control
quality controls » quality control, qualite controle, quality concepts
_quality control » quality control, qouality control, qualify control
2 reliability » 3 reliability
5 reliability » 3 reliability
2c safety » 2 safety, 23 safety, 25 safety
22 safety » 2 safety, 12 safety, 5 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 controls))) OR (byquality control))) OR (_quality control))%((2 reliability) OR (5 reliability))%((2c safety) OR (22 safety)) AND risk%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%((((((22quality control) OR (quality controls))) or (byquality control))) or (_quality control))%((2 reliability) or (5 reliability))%((2c safety) or (22 safety)) and risk%22".
• Adding a wildcard symbol may retrieve word variants: %((((((22quality control) OR (quality controls))) or (byquality control))) or (_quality control))%((2 reliability) or (5 reliability))%((2c safety) or (22 safety)) and risk%22*.