Perhaps you should try some spelling variations:
_quality control » quality control, byquality control, quality controls
2c reliability » 2 reliability, 20 reliability, 24 reliability
9 reliability » 3 reliability, 2 reliability, 4 reliability
5 reliability » 3 reliability
3 safety » 5 safety, 4 safety
2 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 (((9 reliability) OR (5 reliability))))%((3 safety) OR (2 safety)) AND risk%22.
• Adding a wildcard symbol may retrieve word variants: %_quality control%((2c reliability) or (((9 reliability) or (5 reliability))))%((3 safety) or (2 safety)) and risk%22*.