V-Ray versions are lower than 3.1, be careful; in the materials in the BRDF section, there is Microfacet GTR (GGX). If your version is older than 3.1, then the BRDF field will be empty. Choose Blinn, Phong, or Ward - whichever suits you best.

For Corona Render, it is recommended to install a version of at least 1.5, as the glossiness of materials is configured with PBR in mind.