Zero VOC or NO VOC paint is a misnomer and only means very, very low levels of VOC. Usually paints marketed with these titles will have VOC's in the range of under 5 g/L. Even when adding in pigment at the paint store which can add 2-5 g/L of VOC, the total VOC content for the mixed paint should be under 10 g/L which is excellent.
This low level of VOC content paint is as good as it's going to get with the larger paint companies.
An example of a paint that meets this spec is Harmony® Paint by Sherwin-Williams. (www.sherwin.com)
To get lower VOC content than this you'll need to use more expensive and less readily available Non-Toxic or Natural Paint.