How to find recent questions without answers and comments

I am wondering how to find questions where people really need help?

I mean that these should most like be questions which don't have answers yet, not closed, created recently (not already forgotten by the authors), and not accepted as solved.

I tried the following request:

isaccepted:no answers: 0 created: 3d closed: no

but as the second line got the response:How is a 3d perlin noise function used to generate terrain?which have answers and one of them is already accepted.

Questions:

1. What I did wrong and how to improve the search query?
2. Is there a way to find questions without comments? (Since I suppose that they most challenging and people need help there most).