| | Category | Item |
| | Cluster 1 | Computer games, system, students, motivation, performance, digital game, English vocabulary, and meta-analysis | | Cluster 2 | Education, anxiety, environment, self-efficacy, digital game-based learning, instruction, and interactive learning environments | | Cluster 3 | Game-based learning, knowledge, vocabulary, EFL students, English grammar, and game | | Cluster 4 | English learning, gamification, serious games, design, language learning, and model | | Cluster 5 | English, language, technology, learning, educational game, and ICT | | Cluster 6 | Impact, games, mobile learning, and English language learning | | Cluster 7 | Educational games, college English teaching, English proficiency, and strategies |
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