Perhaps you should try some spelling variations:
quality controls » quality control, qualite controle, quality concepts
20 reliability » 10 reliability, 24 reliability, 29 reliability
2 reliability » 3 reliability, 5 reliability
9 reliability » 3 reliability, 5 reliability, 4 reliability
2c safety » 2 safety, 22 safety, 23 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 controls%((((20 reliability) OR (2 reliability))) OR (9 reliability))%((2c safety) OR (5 safety)) AND risk%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%quality controls%((((20 reliability) OR (2 reliability))) or (9 reliability))%((2c safety) or (5 safety)) and risk%22".
• Adding a wildcard symbol may retrieve word variants: %quality controls%((((20 reliability) OR (2 reliability))) or (9 reliability))%((2c safety) or (5 safety)) and risk%22*.