How can I get my children back home to Israel, from Thailand, after my Thai wife refuses to return to Israel after a holiday?

By invoking the 1980 Hague Convention on the Civil Aspects of Child Abduction which applies to alleged acts of international child abduction between Israel and Thailand since 1/11/03. You can start off the process in Israel but the proceedings will take place in Thailand and you will be appointed a lawyer by the Central Authority in Thailand ,created  under the convention, to represent you there.