Perhaps you should try some spelling variations:
2.4 reliability » 2.6 reliability, 2.2 reliability, 2.3 reliability
5.4 reliability » 5 reliability, 14 reliability, 2.6 reliability
2c reliability » 2 reliability, 24 reliability, 20 reliability
ic reliability » 2 reliability, 5 reliability, 9 reliability
2c safety » 22 safety, 23 safety, 25 safety
10 safety » _ safety, a safety, 5 safety
2 safety » _ safety, a safety, 5 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%((((2c reliability) OR (((2.4 reliability) OR (5.4 reliability))))) OR (((ic reliability) OR (3 reliability))))%((((2c safety) OR (2 safety))) OR (10 safety)) AND risk%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%quality control%((((2c reliability) or (((2.4 reliability) or (5.4 reliability))))) or (((ic reliability) or (3 reliability))))%((((2c safety) OR (2 safety))) or (10 safety)) and risk%22".
• Adding a wildcard symbol may retrieve word variants: %quality control%((((2c reliability) or (((2.4 reliability) or (5.4 reliability))))) or (((ic reliability) or (3 reliability))))%((((2c safety) OR (2 safety))) or (10 safety)) and risk%22*.