What title should i search ?
You’re searching under “Issue” instead of “Series” in these screenshots. Change the tab at the top so that “Series” is underlined.
edit to give a little more detail: In your first screenshot you aren’t searching for an issue number, the pop up points this out. I’m not sure what’s up with the second screenshot. In the third screenshot, you typed the wrong title for the series (“Hunter” instead of “Wrangler”).