Perhaps you should try some spelling variations:
22quality control » quality control, forquality control, qouality control
byquality control » quality control, forquality control, qouality control
_quality control » quality control, qouality control, qualify control
quality controls » quality control, qualite controle, quality concepts
2 reliability » 3 reliability
5 reliability » 3 reliability
23 safety » 3 safety, 13 safety, 22 safety
2 safety » 5 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 (byquality control))) OR (((_quality control) OR (quality controls))))%((2 reliability) OR (5 reliability))%((23 safety) OR (2 safety)) AND risk%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%((((22quality control) or (byquality control))) or (((_quality control) OR (quality controls))))%((2 reliability) or (5 reliability))%((23 safety) or (2 safety)) and risk%22".
• Adding a wildcard symbol may retrieve word variants: %((((22quality control) or (byquality control))) or (((_quality control) OR (quality controls))))%((2 reliability) or (5 reliability))%((23 safety) or (2 safety)) and risk%22*.