Is money earned from selling books in countries not mentioned in the sales agreement (whether the agreement specifies permitted countries, or specifies prohibited countries with lying to the supplier) lawful?

The transaction between you and the publishing houses involves a sale with a condition that contradicts the essence of the contract (not selling books in certain countries), and this is prohibited by Islamic law. The majority of scholars are of the opinion that such a condition invalidates the sale, while some permit it if it excludes a small number of people. The preponderant view is that the sale is valid, but the condition is void, so the earned money is lawful. You must repent from this prohibited transaction and lying, and beware of similar dealings in the future.