Task-based language learning using the benefits of online computer-assisted language learning (CALL) can be effective for rapid vocabulary expansion, especially when target vocabulary has been pre-arranged into bilingual categories under simpler, common Semantic Field Keywords. Results and satisfaction levels for both Chinese English majors and Japanese Engineering majors were high in this qualitative comparative study, indicating its potential for helping many students from various language backgrounds to rapidly expand their target language vocabulary, especially when blended with other real language negotiation tasks, preferably for an authentic audience. Print versus online reading and vocabulary development methods are compared, as well as surveys of both Chinese and Japanese college students, after they were engaged in a "Collaborative Writing Exchange Project" using similar online vocabulary development tools. All target terms were preorganized and made available under common Semantic Field Keywords online in both Japanese and Chinese, but students had freedom to choose within sets of most relevant words from five academic disciplines. Writing themes were suggested to learners in both countries to keep their email exchanges consistent.