Perhaps you should try some spelling variations:
_quality control » quality control, byquality control, quality controls
2c reliability » 24 reliability, ic reliability, 20 reliability
11 reliability » 1 reliability, 5 reliability, 8 reliability
9 reliability » 5 reliability, 4 reliability
2 reliability » 5 reliability
4 safety » _ safety, a safety, 5 safety

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 (((11 reliability) OR (((((9 reliability) OR (3 reliability))) OR (2 reliability))))))%4 safety AND risk%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%_quality control%((2c reliability) or (((11 reliability) or (((((9 reliability) OR (3 reliability))) or (2 reliability))))))%4 safety and risk%22".
• Adding a wildcard symbol may retrieve word variants: %_quality control%((2c reliability) or (((11 reliability) or (((((9 reliability) OR (3 reliability))) or (2 reliability))))))%4 safety and risk%22*.