Perhaps you should try some spelling variations:
22quality control » _quality control, byquality control, forquality control
2.4 reliability » 2.6 reliability, 5.4 reliability, 2.2 reliability
2c reliability » 2 reliability, 20 reliability, 24 reliability
ic reliability » 5 reliability, 2 reliability, 7 reliability
3 reliability » 5 reliability
2c safety » 2 safety, 22 safety, 23 safety
a safety » a safe

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))%((((2c reliability) OR (2.4 reliability))) OR (((ic reliability) OR (3 reliability))))%((2c safety) OR (a safety)) AND risk%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%((22quality control) OR (quality control))%((((2c reliability) or (2.4 reliability))) or (((ic reliability) or (3 reliability))))%((2c safety) or (a safety)) and risk%22".
• Adding a wildcard symbol may retrieve word variants: %((22quality control) OR (quality control))%((((2c reliability) or (2.4 reliability))) or (((ic reliability) or (3 reliability))))%((2c safety) or (a safety)) and risk%22*.