How can I search with the "newest" and "no answers" options simultaneously?
For example, when going "No Answers" tab, I don't see a way to sort by "Newest":
You can use the search filter
[android] answers:0 and sort by Newest.
There's a bunch of other useful tips you can use; for this, click the "Advanced search tips" on the right. See also the advanced search help page.