Perhaps you should try some spelling variations:
_quality control » quality control, byquality control, qouality control
quality controls » quality control, qualite controle, quality concepts
2c reliability » 20 reliability, 24 reliability, 29 reliability
2 reliability » 3 reliability, 5 reliability
2c safety » 2 safety, 22 safety, 23 safety
3 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) OR (quality controls))%((2c reliability) OR (2 reliability))%((2c safety) OR (((3 safety) OR (5 safety)))) AND risk%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%((_quality control) OR (quality controls))%((2c reliability) or (2 reliability))%((2c safety) or (((3 safety) or (5 safety)))) and risk%22".
• Adding a wildcard symbol may retrieve word variants: %((_quality control) OR (quality controls))%((2c reliability) or (2 reliability))%((2c safety) or (((3 safety) or (5 safety)))) and risk%22*.