Perhaps you should try some spelling variations:
22quality control » quality control, byquality control, forquality control
_quality control » quality control, byquality control, qouality control
quality controls » quality control, qualite controle, quality concepts
2.6 reliability » 16 reliability, 3.3 reliability, 5.4 reliability
2 reliability » 3 reliability, 5 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 controls))))%((2.6 reliability) OR (2 reliability))%((2c safety) OR (2 safety)) AND risk%22.
• Adding a wildcard symbol may retrieve word variants: %((22quality control) or (((_quality control) or (quality controls))))%((2.6 reliability) or (2 reliability))%((2c safety) or (2 safety)) and risk%22*.