Secondly, more recent research has failed to support this hypothesis.

Conor began to wonder how much more about the company his research had failed to show up.

Analysts whose research fails to hold up quickly find that fund managers will no longer return their calls.

However, all later archeological research have failed in finding any evidence of it.

However, research has failed to show that these have an effect.

Subsequent research has failed to confirm the initial positive result.

Certainly, thorough research in the early 20th century failed to find the bird again.

Basic medical research has failed to meet many reasonable goals.

Unfortunately his research had failed to turn up anything conclusive.