Perhaps you should try some spelling variations:
2.4 reliability » 2.6 reliability, 5.4 reliability, 2.2 reliability
24 reliability » 2 reliability, 14 reliability, 20 reliability
ic reliability » 5 reliability, 2 reliability, 7 reliability
9 reliability » 3 reliability, 5 reliability, 2 reliability
2 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: %quality control%((((24 reliability) OR (2.4 reliability))) OR (((ic reliability) OR (9 reliability))))%((2 safety) OR (5 safety)) AND risk%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%quality control%((((24 reliability) OR (2.4 reliability))) or (((ic reliability) or (9 reliability))))%((2 safety) or (5 safety)) and risk%22".
• Adding a wildcard symbol may retrieve word variants: %quality control%((((24 reliability) OR (2.4 reliability))) or (((ic reliability) or (9 reliability))))%((2 safety) or (5 safety)) and risk%22*.