Fixing audio in Davinci Resolve

[sH0k3n]

Hi!
Recently I have received a video in which the audio is messed up. In the background you can hear some working machines and general noise. I have tried lowering the levels; using the noise reduction; using the de-esser/de-hummer, but nothing has done the expected job. I have never worked with such audio, so my experience is not helping here.
Other apps I can use are Audacity and Premiere Pro (alternatively I can use yet another program if it solves my problem).

Link to the sample of video and audio: https://youtu.be/p-0ywiEQxPo

Do you have any tips on how to work with such audio troubles?

[ChapmanDolly]

If you have the Studio version of DaVinci Resolve you could use Voice Isolation to minimize or remove the background noise.