(Piaget OR Jean Piaget) (Piaget OR Jean Piaget)
AND(theor* OR idea*) or AND(theor* OR idea*)
AND(use* OR practic*) AND(Vygotsky OR Lev Vygotsky)
AND(theor* OR idea*)
Math:
Piaget +theor* - Vygotsky
or
Piaget +Vygotsky +theor*
or
Piaget +theor* +use*
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