Perhaps you should try some spelling variations:
_quality control » quality control, byquality control, qouality control
quality controls » quality control, qualite controle, quality concepts
21 reliability » 2 reliability, 1 reliability, 11 reliability
9 reliability » 2 reliability, 5 reliability, 4 reliability
23 safety » 3 safety, 2 safety, 22 safety
13 safety » 3 safety, 10 safety, 11 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 (quality controls))%((((9 reliability) OR (21 reliability))) OR (3 reliability))%((23 safety) OR (13 safety)) AND risk%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%((_quality control) or (quality controls))%((((9 reliability) or (21 reliability))) or (3 reliability))%((23 safety) OR (13 safety)) and risk%22".
• Adding a wildcard symbol may retrieve word variants: %((_quality control) or (quality controls))%((((9 reliability) or (21 reliability))) or (3 reliability))%((23 safety) OR (13 safety)) and risk%22*.