Perhaps you should try some spelling variations:
22quality control » quality control, byquality control, forquality control
_quality control » quality control, byquality control, quality controls
qualify control » quality control, quality controls, qouality control
29 reliability » 2 reliability, 9 reliability, 20 reliability
23 safety » 3 safety, 2 safety, 13 safety
22 safety » 2 safety, 12 safety, 5 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 (qualify control))))%29 reliability%((23 safety) OR (22 safety)) AND risk%22.
• Adding a wildcard symbol may retrieve word variants: %((22quality control) or (((_quality control) or (qualify control))))%29 reliability%((23 safety) or (22 safety)) and risk%22*.