Perhaps you should try some spelling variations:
_quality control » byquality control, quality controls, qouality control
2c reliability » 2 reliability, 20 reliability, 24 reliability
8 reliability » 2 reliability, 4 reliability, 7 reliability
2a safety » 2 safety, 22 safety, 23 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))%((2c reliability) OR (((((8 reliability) OR (3 reliability))) OR (5 reliability))))%((a safety) OR (2a safety)) AND risk%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%((_quality control) OR (quality control))%((2c reliability) or (((((8 reliability) or (3 reliability))) or (5 reliability))))%((a safety) or (2a safety)) and risk%22".
• Adding a wildcard symbol may retrieve word variants: %((_quality control) OR (quality control))%((2c reliability) or (((((8 reliability) or (3 reliability))) or (5 reliability))))%((a safety) or (2a safety)) and risk%22*.