Perhaps you should try some spelling variations:
2c reliability » 24 reliability, 20 reliability, 21 reliability
ic reliability » 5 reliability, 9 reliability, 8 reliability
2 reliability » 3 reliability, 5 reliability
2c safety » 22 safety, 21 safety, 24 safety
25 safety » 5 safety, 15 safety, 22 safety
23 safety » 3 safety, 13 safety, 22 safety
2 safety » a safety, 5 safety, 4 safety

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: %quality control%((((2c reliability) OR (2 reliability))) OR (ic reliability))%((((((2c safety) OR (25 safety))) OR (2((2 safety) OR (_ safety))))) OR (((23 safety) OR (((2 safety) OR (_ safety)))))) AND risk%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%quality control%((((2c reliability) or (2 reliability))) or (ic reliability))%((((((2c safety) OR (25 safety))) or (2((2 safety) or (_ safety))))) or (((23 safety) or (((2 safety) or (_ safety)))))) and risk%22".
• Adding a wildcard symbol may retrieve word variants: %quality control%((((2c reliability) or (2 reliability))) or (ic reliability))%((((((2c safety) OR (25 safety))) or (2((2 safety) or (_ safety))))) or (((23 safety) or (((2 safety) or (_ safety)))))) and risk%22*.