Perhaps you should try some spelling variations:
forquality control » quality control, byquality control, qouality control
_quality control » quality control, byquality control, quality controls
21 reliability » 1 reliability, 11 reliability, 20 reliability
2 reliability » 3 reliability
5 reliability » 3 reliability
2 safety » 4 safety, 3 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: %((_quality control) OR (forquality control))%((((21 reliability) OR (2 reliability))) OR (5 reliability))%((2 safety) OR (5 safety)) AND risk%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%((_quality control) or (forquality control))%((((21 reliability) or (2 reliability))) or (5 reliability))%((2 safety) OR (5 safety)) and risk%22".
• Adding a wildcard symbol may retrieve word variants: %((_quality control) or (forquality control))%((((21 reliability) or (2 reliability))) or (5 reliability))%((2 safety) OR (5 safety)) and risk%22*.