Perhaps you should try some spelling variations:
_quality control » quality control, byquality control, quality controls
2 reliability » 3 reliability, 5 reliability
9 reliability » 3 reliability, 5 reliability, 4 reliability
2c safety » 2 safety, 23 safety, 25 safety
22 safety » 2 safety, 12 safety, 4 safety
3 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: %_quality control%((2 reliability) OR (9 reliability))%((((2c safety) OR (22 safety))) OR (((((3 safety) OR (5 safety))) OR (a safety)))) AND risk%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%_quality control%((2 reliability) or (9 reliability))%((((2c safety) or (22 safety))) or (((((3 safety) OR (5 safety))) or (a safety)))) and risk%22".
• Adding a wildcard symbol may retrieve word variants: %_quality control%((2 reliability) or (9 reliability))%((((2c safety) or (22 safety))) or (((((3 safety) OR (5 safety))) or (a safety)))) and risk%22*.