'Learning science by learning one English word per day' , I don't think this will work for children's benefits. Perhaps, one science "concept" per day in English, in Thai and in other media: video, construction, experiment, etc may do some good. ;-)  For example one word 'heat' -

Heat: concepts involving heat

specific heat, heat transfer, caloric heat/calory/joule/BTU, latent heat,,...

temperature, absolute zero (0K), (Einstein's) condensates, (volume) expansion+contraction,...

high pressure/low pressure (weather) cells, convection, cyclone, twister, tornado,...

heat engine, steam, hot air engine, cooking/baking, drying, welding,...