The research aims to reflect on the notions and actions of international education, in order to effectively develop human resources in Taiwan to fit the internationalized world. Accordingly, a case study is conducted on the service-learning projects of two international non-governmental organizations (NGOs) operating in Cambodia in cooperation with overseas schools. A major objective is to critically review how students from rich industrial countries can effectively strengthen their interactive understandings of a developing country. The study differentiates the two domains of the concepts of international education: normative notions and instrumental meanings, which are different from each other in terms of different subjects, issues in focus, and implemental agencies. On the other hand, the findings show that overseas schools in partnership with NGOs have better result in the implementation of serving-learning activities. By means of NGOs’ abundant experience of international development and cross-cultural management in developing countries, overseas students’ understanding of international education can be greatly enhanced to be more capable to face the changes and challenges in the globalized and regionalized world in the 21st century.