Perhaps you should try some spelling variations:
22quality control » quality control, _quality control, byquality control
2.4 reliability » 2.6 reliability, 5.4 reliability, 2.2 reliability
2c reliability » 2 reliability, 29 reliability, 21 reliability
20 reliability » 2 reliability, 10 reliability, 29 reliability
24 reliability » 2 reliability, 14 reliability, 29 reliability
ic reliability » 2 reliability, 7 reliability, 8 reliability
5 reliability » 3 reliability
2c safety » 2 safety, 22 safety, 23 safety
a safety » a safe

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%((((((2c reliability) OR (20 reliability))) OR (((24 reliability) OR (2.4 reliability))))) OR (((ic reliability) OR (5 reliability))))%((2c safety) OR (a safety)) AND risk%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%22quality control%((((((2c reliability) OR (20 reliability))) or (((24 reliability) or (2.4 reliability))))) or (((ic reliability) or (5 reliability))))%((2c safety) or (a safety)) and risk%22".
• Adding a wildcard symbol may retrieve word variants: %22quality control%((((((2c reliability) OR (20 reliability))) or (((24 reliability) or (2.4 reliability))))) or (((ic reliability) or (5 reliability))))%((2c safety) or (a safety)) and risk%22*.