Perhaps you should try some spelling variations:
22quality control » quality control, _quality control, byquality control
quality controls » quality control, qualite controle, quality concepts
qualify control » quality control, _quality control, qouality control
2.4 reliability » 2.6 reliability, 5.4 reliability, 2.2 reliability
2c safety » 2 safety, 22 safety, 23 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 controls) OR (qualify control))))%2.4 reliability%2c safety AND risk%22.
• Adding a wildcard symbol may retrieve word variants: %((22quality control) or (((quality controls) or (qualify control))))%2.4 reliability%2c safety and risk%22*.