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