You can't rely on the options for Google Image search. Instead, you will have to do additional research for each of the images you find and intend to use.
First, you need to find the original author/creator of that image. It may or may not be the same as the owner/creator of the web site where you find the image. (They may have copied the image from somewhere else, with or without permission.) You can use Google Image search "search by image" option to find other copies of that same image on other sites.
Second, you need to find the copyright statement for that image on the site of the owner. In many cases, you'll find a copyright statement as part of the "Terms of Service" for the whole web site. In other cases, there will be a copyright statement for each and every image.
Third, when in doubt, you need to contact the author/owner and ask for permission to use the image.
If all this seems cumbersome and so non-digital, be aware that copyright law (and intellectual property rights law in general) still lives in the pre-digital age. Lawyers still send faxes to each other and to the courts. Think about that.