Perhaps you should try some spelling variations:
22quality control » quality control, forquality control, quality controls
byquality control » quality control, forquality control, quality controls
_quality control » quality control, quality controls, qouality control
29 reliability » 2 reliability, 9 reliability, 20 reliability
23 safety » 3 safety, 22 safety, 5 safety
13 safety » 3 safety, 10 safety, 11 safety
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 (((_quality control) OR (byquality control))))%29 reliability%((((23 safety) OR (13 safety))) OR (2 safety)) AND risk%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%((22quality control) or (((_quality control) or (byquality control))))%29 reliability%((((23 safety) OR (13 safety))) or (2 safety)) and risk%22".
• Adding a wildcard symbol may retrieve word variants: %((22quality control) or (((_quality control) or (byquality control))))%29 reliability%((((23 safety) OR (13 safety))) or (2 safety)) and risk%22*.