Perhaps you should try some spelling variations:
_quality control » byquality control, quality controls, qouality control
21 reliability » 1 reliability, 11 reliability, 20 reliability
8 reliability » 3 reliability, 4 reliability, 7 reliability
2 reliability » 3 reliability
5 reliability » 3 reliability
23 safety » 3 safety, 2 safety, 13 safety
a safety » a safe

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 control))%((((8 reliability) OR (21 reliability))) OR (((2 reliability) OR (5 reliability))))%((23 safety) OR (a safety)) AND risk%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%((_quality control) or (quality control))%((((8 reliability) or (21 reliability))) or (((2 reliability) OR (5 reliability))))%((23 safety) or (a safety)) and risk%22".
• Adding a wildcard symbol may retrieve word variants: %((_quality control) or (quality control))%((((8 reliability) or (21 reliability))) or (((2 reliability) OR (5 reliability))))%((23 safety) or (a safety)) and risk%22*.