Perhaps you should try some spelling variations:
22quality control » quality control, _quality control, byquality control
2 reliability » 3 reliability
9 reliability » 3 reliability, 4 reliability
5 reliability » 3 reliability
22 safety » 12 safety, 5 safety, 4 safety
23 safety » 3 safety, 13 safety, 5 safety
2 safety » 5 safety, 4 safety, 3 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: %22quality control%((2 reliability) OR (((9 reliability) OR (5 reliability))))%((((22 safety) OR (2 safety))) OR (((23 safety) OR (_ safety)))) AND risk%22*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%22quality control%((2 reliability) or (((9 reliability) or (5 reliability))))%((((22 safety) OR (2 safety))) or (((23 safety) or (_ safety)))) and risk%22*".