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

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