Perhaps you should try some spelling variations:
22quality control » quality control, _quality control, byquality control
quality concepts » stability concepts
2c reliability » 2 reliability, 20 reliability, 24 reliability
5 reliability » 3 reliability
2c safety » 23 safety, 21 safety, 24 safety
25 safety » 5 safety, 15 safety, 23 safety
22 safety » 12 safety, 5 safety, 4 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) OR (quality concepts))%((2c reliability) OR (5 reliability))%((((((2c safety) OR (25 safety))) OR (2 safety))) OR (22 safety)) AND risk%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%((22quality control) or (quality concepts))%((2c reliability) or (5 reliability))%((((((2c safety) OR (25 safety))) or (2 safety))) or (22 safety)) and risk%22".
• Adding a wildcard symbol may retrieve word variants: %((22quality control) or (quality concepts))%((2c reliability) or (5 reliability))%((((((2c safety) OR (25 safety))) or (2 safety))) or (22 safety)) and risk%22*.