Perhaps you should try some spelling variations:
2c reliability » 20 reliability, 24 reliability, 29 reliability
2 reliability » 3 reliability, 5 reliability
8 reliability » 3 reliability, 5 reliability, 4 reliability
21 safety » 11 safety, 1 safety, 22 safety
23 safety » 3 safety, 13 safety, 22 safety
2 safety » 4 safety, 3 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 (8 reliability))%((((21 safety) OR (_ safety))) OR (((23 safety) OR (((2 safety) OR (5 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 (8 reliability))%((((21 safety) or (_ safety))) or (((23 safety) or (((2 safety) OR (5 safety)))))) and risk%22".
• Adding a wildcard symbol may retrieve word variants: %quality control%((((2c reliability) or (2 reliability))) or (8 reliability))%((((21 safety) or (_ safety))) or (((23 safety) or (((2 safety) OR (5 safety)))))) and risk%22*.