Perhaps you should try some spelling variations:
22quality control » quality control, byquality control, forquality control
_quality control » quality control, byquality control, quality controls
qouality control » quality control, quality controls, qualify control
2.6 reliability » 2 reliability, 16 reliability, 3.3 reliability
29 reliability » 2 reliability, 9 reliability, 20 reliability
24 reliability » 2.4 reliability, 2 reliability, 4 reliability
2c safety » 2 safety, 23 safety, 25 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 (qouality control))))%((((29 reliability) OR (2.6 reliability))) OR (24 reliability))%((2c safety) OR (22 safety)) AND risk%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%((22quality control) or (((_quality control) or (qouality control))))%((((29 reliability) or (2.6 reliability))) or (24 reliability))%((2c safety) OR (22 safety)) and risk%22".
• Adding a wildcard symbol may retrieve word variants: %((22quality control) or (((_quality control) or (qouality control))))%((((29 reliability) or (2.6 reliability))) or (24 reliability))%((2c safety) OR (22 safety)) and risk%22*.