Perhaps you should try some spelling variations:
_quality control » byquality control, quality controls, qouality control
2c reliability » 2 reliability, 20 reliability, 24 reliability
8 reliability » 5 reliability, 2 reliability, 4 reliability
3 reliability » 5 reliability
22 safety » 12 safety, 5 safety, 4 safety
2 safety » 5 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) OR (quality control))%((2c reliability) OR (((8 reliability) OR (3 reliability))))%((2 safety) OR (22 safety)) AND risk%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%((_quality control) OR (quality control))%((2c reliability) or (((8 reliability) or (3 reliability))))%((2 safety) or (22 safety)) and risk%22".
• Adding a wildcard symbol may retrieve word variants: %((_quality control) OR (quality control))%((2c reliability) or (((8 reliability) or (3 reliability))))%((2 safety) or (22 safety)) and risk%22*.