I gave ear to your reasons - Margin, “understandings.” The meaning is, that he had given the most respectful attention to the views which they had expressed, implying that he had been all along present, and had listened to the debate.
Whilst ye searched out what to say - Margin, as in Hebrew, words. It is implied here that they had bestowed much attention on what they had said. They had carefully sought out all the arguments at their command to confute Job, and still had been unsuccessful.