Perhaps you should try some spelling variations:
22quality control » quality control, _quality control, byquality control
20 reliability » 10 reliability, 24 reliability, 29 reliability
2 reliability » 3 reliability
5 reliability » 3 reliability
15 safety » 10 safety, 11 safety, 1 safety
3 safety » 4 safety
2 safety » 4 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%((((20 reliability) OR (2 reliability))) OR (5 reliability))%((15 safety) OR (((3 safety) OR (((((2 safety) OR (5 safety))) OR (a safety)))))) AND risk%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%22quality control%((((20 reliability) or (2 reliability))) or (5 reliability))%((15 safety) or (((3 safety) or (((((2 safety) OR (5 safety))) or (a safety)))))) and risk%22".
• Adding a wildcard symbol may retrieve word variants: %22quality control%((((20 reliability) or (2 reliability))) or (5 reliability))%((15 safety) or (((3 safety) or (((((2 safety) OR (5 safety))) or (a safety)))))) and risk%22*.