tato vatsan adrstvaitya
puline ’pi ca vatsapan
ubhav api vane krsno
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
Thereafter, when Krsna was unable to find the calves, He returned to the bank of the river, but there He was also unable to see the cowherd boys. Thus He began to search for both the calves and the boys, as if He could not understand what had happened.
Purport by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
Krsna could immediately understand that Brahma had taken away both the calves and the boys, but as an innocent child He searched here and there so that Brahma could not understand Krsna’s maya. This was all a dramatic performance. A player knows everything, but still he plays on the stage in such a way that others do not understand him.