id	keyword
edu-872	science
edu-872	countries
edu-872	education
edu-872	journal
edu-872	study
edu-872	japan
edu-872	poland
edu-872	pisa
edu-872	estonia
edu-872	data
edu-872	efficiency
edu-872	students
edu-872	teaching
edu-872	inputs
edu-872	total
edu-872	science education
edu-872	success
edu-872	turkey
edu-872	learning
edu-872	asian
edu-872	percentage
edu-872	china
edu-872	teachers