A diligent search failed to turn up even a trace of the boot heel.

For at least a week after its coming, diligent search is necessary to find the site of implantation.

No search, however diligent and anxious, could trace her steps.

I heard of this story long ago and know that a diligent search has been made for the enchanted Prince, without result.

But we did not find the ducks, although we made a diligent search for half an hour.

Last September, he got a letter saying the records "cannot be found after a diligent search."

After a diligent search, I could find no earlier mention.

By his command diligent search was made for the body.

Here are a few turned up by a diligent search.

Eventually his diligent search is rewarded in the parking lot behind a church.