Perhaps you should try some spelling variations:
_quality control » quality control, byquality control, quality controls
2c reliability » 24 reliability, ic reliability, 20 reliability
9 reliability » 4 reliability
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 (((((9 reliability) OR (3 reliability))) OR (5 reliability))))%((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 (((((9 reliability) or (3 reliability))) or (5 reliability))))%((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 (((((9 reliability) or (3 reliability))) or (5 reliability))))%((23 safety) or (((2 safety) OR (_ safety)))) and risk%22*.