Perhaps you should try some spelling variations:
22quality control » quality control, byquality control, forquality control
_quality control » quality control, byquality control, quality controls
quality concepts » stability concepts
29 reliability » 2 reliability, 9 reliability, 20 reliability
24 reliability » 2.4 reliability, 2 reliability, 4 reliability
2c safety » 22 safety, 23 safety, 25 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 (((_quality control) OR (quality concepts))))%((29 reliability) OR (24 reliability))%((2c safety) OR (2 safety)) AND risk%22.
• Adding a wildcard symbol may retrieve word variants: %((22quality control) or (((_quality control) or (quality concepts))))%((29 reliability) or (24 reliability))%((2c safety) or (2 safety)) and risk%22*.