Perhaps you should try some spelling variations:
22quality control » byquality control, forquality control, quality contol
qouality control » quality contral, forquality control, byquality control
_quality control » byquality control, quality contol, quality contral
quality controls » qualite controle
quality concepts » stability concepts
qualify control » quality contol, quality contral, byquality control
29 reliability » 2 reliability, 20 reliability, 24 reliability
9 reliability » 3 reliability, 5 reliability, 2 reliability
2 safety » 5 safety, 4 safety, 3 safety

Try widening your search to All Fields.

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 (qouality control))) OR (((((((_quality control) OR (quality control))) OR (((quality controls) OR (quality concepts))))) OR (qualify control))))%((29 reliability) OR (9 reliability))%2 safety AND risk%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%((((22quality control) OR (qouality control))) or (((((((_quality control) or (quality control))) or (((quality controls) or (quality concepts))))) or (qualify control))))%((29 reliability) or (9 reliability))%2 safety and risk%22".
• Adding a wildcard symbol may retrieve word variants: %((((22quality control) OR (qouality control))) or (((((((_quality control) or (quality control))) or (((quality controls) or (quality concepts))))) or (qualify control))))%((29 reliability) or (9 reliability))%2 safety and risk%22*.