Perhaps you should try some spelling variations:
_quality control » byquality control, quality controls, qouality control
21 reliability » 1 reliability, 11 reliability, 20 reliability
ic reliability » 3 reliability, 5 reliability, 7 reliability
2 reliability » 3 reliability, 5 reliability
4 reliability » 3 reliability, 5 reliability
2c safety » 2 safety, 23 safety, 25 safety
22 safety » 2 safety, 12 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) OR (quality control))%((((((2 reliability) OR (21 reliability))) OR (4 reliability))) OR (ic reliability))%((2c 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))%((((((2 reliability) or (21 reliability))) or (4 reliability))) or (ic reliability))%((2c safety) OR (22 safety)) and risk%22".
• Adding a wildcard symbol may retrieve word variants: %((_quality control) or (quality control))%((((((2 reliability) or (21 reliability))) or (4 reliability))) or (ic reliability))%((2c safety) OR (22 safety)) and risk%22*.