The documentation does not guarantee correct results in all cases.

Why commit to extra work when it does not guarantee results?

Before you send $ to a scholarship service that guarantees results, do your homework.

The company had guaranteed results, but nothing was done.

"The American philosophy is equal opportunity for everyone, but you can't guarantee results," she said.

Doing the job in an orderly fashion virtually guarantees good results even the first time.

"But you mustn't forget that we are only human and cannot guarantee results."

I don't guarantee results, but at this stage it won't hurt to try desperate measures.

As you said, it's an impossible job, so we won't guarantee results.

I cannot guarantee perfect results within a set time limit.