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