Perhaps you should try some spelling variations:
22disease transmission » disease transmission, diseases transmission, distance transmission
2c infectious » 2 infectious, 21 infectious, 20 infectious
2f prevention » f prevention, 2f prediction, proof prevention
26 control » 6 control, 16 control, 12.6 control

Try widening your search to All Fields.

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• Adding a wildcard symbol may retrieve word variants: %22Disease Transmission%2C Infectious %2F Prevention %26 Control%22*.