Perhaps you should try some spelling variations:
_quality control » quality control, byquality control, quality controls
2c reliability » 20 reliability, 24 reliability, 29 reliability
ic reliability » 7 reliability, 8 reliability, 11 reliability
2 reliability » 3 reliability
9 reliability » 3 reliability, 4 reliability
5 reliability » 3 reliability
2c safety » 22 safety, 23 safety, 25 safety
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%((((2c reliability) OR (2 reliability))) OR (((((ic reliability) OR (9 reliability))) OR (5 reliability))))%((2c safety) OR (((2((2 safety) OR (5 safety))) OR (((2 safety) OR (5 safety)))))) AND risk%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%_quality control%((((2c reliability) or (2 reliability))) or (((((ic reliability) or (9 reliability))) or (5 reliability))))%((2c safety) or (((2((2 safety) OR (5 safety))) or (((2 safety) OR (5 safety)))))) and risk%22".
• Adding a wildcard symbol may retrieve word variants: %_quality control%((((2c reliability) or (2 reliability))) or (((((ic reliability) or (9 reliability))) or (5 reliability))))%((2c safety) or (((2((2 safety) OR (5 safety))) or (((2 safety) OR (5 safety)))))) and risk%22*.