VOC could mean Volatile Organic Compound or Volatile Organic Chemical.

Gasoline, kerosene, almost any thinner, and any organic solvent that evaporates at "normal' temperatures could be considered a VOC.

Lacquer Thinner is a VOC.

Different words mean different things to different companies and people. Here is a general definition: "Diluent: A liquid used in coatings to reduce the consistency and make a coating flow more easily. The water in latex coatings is a diluent. A diluent may also be called a "Reducer," "Thinner," "Reducing Agent" or "Reducing Solvent." "

As asked above, what is the brand (and line) of paint? You can't lose if you follow Capt. Al's advice. If your seller cannot provide clear information, the safest thing to do is to look on-line for what that manufacturer recommends for that paint.